Questions on Algebra: Evaluation of expressions, parentheses answered by real tutors!

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Question 1137806: This is my son's homework. Would appreciate your help with a grade appropriate solution. Thank you in advance.

Briana bought 5 bananas for $1. Sal bought 5 bananas at $.49 a pound. If a banana weighs about 5 ounces, who got the better buy?
(16 oz 5 1 lb)
a. How much did Briana pay per ounce for the bananas?
b. How much did Sal pay per ounce for the bananas?
c. Who got the better buy?

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Question 1137937: The product of a number and 22 is -110 answer this please thank you
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Question 1137993: Hannah's school hosted a book donation. There are 150 students at her school, and they donated a total of b books. Hannah donated 3 times as many as the average number of books each student donated. How many books did Hannah donate? Write your answer as an expression.
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Question 1138033: 4(8-X)
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Question 1138225: solve the system by back substitution
4x+8y+2z+6w=-4
-3y-18z-6w=-24
-5z-5w=-10
5w=15
i solved from the bottom and got w=3 and kept plugging into each equation and i ended up with w=3,z=-1,y=14/3 and x=-43/3
but it says my answers are wrong help please.

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Question 1139592: Suppose that the functions r and s
are defined for all real numbers x as follows.
r(x)=x+2
s(x)=4x^2
Write the expressions for (r+s)(x) and (r-s)(x) and evaluate (r times s)(-2).

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Question 1139607: 3(x-3)=5(1.5+x)
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Question 1140100: 10C7
————
5P3

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Question 1140100: 10C7
————
5P3

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Question 1140543: With the digits 2, 3, 4 and 5 (using only these digits and using them all but only once) select any math operations (addition subtraction, multiplication, division, parentheses, roots, exponents, factorials) to be used only one time to create an equation whose answer equals 26. Be sure to follow order of operations rules.
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Question 1140647: The imaginary number i is defined i^2 = -1. What is the value of i^147?
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Question 1141467: evaluate 10p4=
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Question 1141467: evaluate 10p4=
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Question 1141118: judy frog hops up a 2/3rd of the ladder, slides down a 1/7th of the ladder from where she is at to the ground and then climbs up 2/5th of the remaining ladder distance to the top. How far is judy off the ground?
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Question 1141616:
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Question 1141616:
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Question 1141656: slope of 2 and y-intercept of -4 turned into an equation
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Question 1141656: slope of 2 and y-intercept of -4 turned into an equation
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Question 1142168: One fifth of a number increased by 8
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Question 1142286: Eleven subtracted from eleven times a number is 33. What is the number?

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Question 1142603: Two college students have started their own business building computers from kits. Working alone, one student can build a computer in 20 hours. When the second student helps, they can build a computer in 7.5 hours. How long would it take the second student, working alone to build the computer? create and equation and solve
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Question 1142603: Two college students have started their own business building computers from kits. Working alone, one student can build a computer in 20 hours. When the second student helps, they can build a computer in 7.5 hours. How long would it take the second student, working alone to build the computer? create and equation and solve
Click here to see answer by ikleyn(52832) About Me 
Question 1142603: Two college students have started their own business building computers from kits. Working alone, one student can build a computer in 20 hours. When the second student helps, they can build a computer in 7.5 hours. How long would it take the second student, working alone to build the computer? create and equation and solve
Click here to see answer by greenestamps(13203) About Me 

Question 1142664: To prepare for a marathon​ run, Sue ran 30 miles before she blistered her​ heel, and then she walked 1 additional mile. Her running speed was 12 times as fast as her walking speed. She was running and walking for 7 hours. Find​ Sue's running speed.
Click here to see answer by Alan3354(69443) About Me 
Question 1142664: To prepare for a marathon​ run, Sue ran 30 miles before she blistered her​ heel, and then she walked 1 additional mile. Her running speed was 12 times as fast as her walking speed. She was running and walking for 7 hours. Find​ Sue's running speed.
Click here to see answer by josmiceli(19441) About Me 
Question 1142664: To prepare for a marathon​ run, Sue ran 30 miles before she blistered her​ heel, and then she walked 1 additional mile. Her running speed was 12 times as fast as her walking speed. She was running and walking for 7 hours. Find​ Sue's running speed.
Click here to see answer by josgarithmetic(39623) About Me 
Question 1142664: To prepare for a marathon​ run, Sue ran 30 miles before she blistered her​ heel, and then she walked 1 additional mile. Her running speed was 12 times as fast as her walking speed. She was running and walking for 7 hours. Find​ Sue's running speed.
Click here to see answer by MathTherapy(10555) About Me 

Question 1142776: Find the integral of e^(logx).
The solutions gave the answer as x^2/2 +c, but I'm prety sure that logx is not the same as lnx ??

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Question 1142780: The acceleration of a particle at a position x on the number line is given bya=-25x.
Initially the particle is at the origin and has a velocity of 10m/s.
Find the velocity after pi/15 seconds.

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Question 1142816: The period of a particle moving in SHM is 6 seconds and its amplitude is 8cm. Calculate its velocity and acceleration to 1dp when the particle is 5cm from the centre of motion.
I currently have x=8cos(pi/3 t + alpha), but I'm not sure how to get alpha.

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Question 1142810: The velocity of a particle is given by: v=1/(4cos2x) and initially the particle is at the origin. Find the total time of motion.
I do not understand why the answer is 2.

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Question 1143111: Given t=112.5 degrees, show that 2t/1-t^2 =1. Hence show that tan 112.5 degrees = -sqr2 -1. What does the other root of the equation represent?
I'm just having trouble with the last part of the question.

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Question 1143111: Given t=112.5 degrees, show that 2t/1-t^2 =1. Hence show that tan 112.5 degrees = -sqr2 -1. What does the other root of the equation represent?
I'm just having trouble with the last part of the question.

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Question 1143134: Evaluate the integral form 0 to pi/4 of sec^2(x)*e^(tanx) with respect to x, using the substitution u=tanx
I got e, I don't understand how this is incorrect?

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Question 1143843: raise j to the 5th power, then find the quotient of the result and k

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Question 1144240: One fifth of the sum of seven and n plus the product of 3 and m
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Question 1144240: One fifth of the sum of seven and n plus the product of 3 and m
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Question 1144240: One fifth of the sum of seven and n plus the product of 3 and m
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Question 1144685:
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Question 1144684:

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Question 1144691: X exponent 400 = 9 exponent 1000. Find x
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Question 1145120: 235.97222 rounded to the nearest cent
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Question 1145854: -20+4•2+7-35=-19
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Question 1146760: Dr.​ VonSprugelzenshoutsmeir's obituary stated that while he lived in Cowlitz County for 32 ​years, he also spent ​1/4 of his life living in​ Africa, ​1/4 in​ Norway, and ​1/6 in Minnesota.  
How old was he when he​ died?  

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Question 1146665: Carlos is going to rent a truck for one day. There are two companies he can choose from, and they have the following prices.
Company A charges $119 and allows unlimited mileage.
Company B has an initial fee of $65 and charges an additional $0.90 for every mile driven.
For what mileages will Company A charge less than Company B?
Use m for the number of miles driven, and solve your inequality for m.

Click here to see answer by Theo(13342) About Me 

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760, 5761..5805, 5806..5850, 5851..5895, 5896..5940, 5941..5985, 5986..6030, 6031..6075, 6076..6120, 6121..6165, 6166..6210, 6211..6255, 6256..6300, 6301..6345, 6346..6390, 6391..6435, 6436..6480, 6481..6525, 6526..6570, 6571..6615, 6616..6660, 6661..6705, 6706..6750, 6751..6795, 6796..6840