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

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Question 681894: 3p(q-r^2) p=-1
q=-3
r=5
What is the solution? I got -66, but in class the teacher says its 84.
3(-1)(-3-5^2)
-3(-3+25)
-3(22)
-66


How do you get 84?

Click here to see answer by jim_thompson5910(35256) About Me 

Question 682231: show the steps to solve this math problem 7(5a-4)-1=14-8a
Click here to see answer by jim_thompson5910(35256) About Me 

Question 682940: y+4=-2/3(x-6) can you simplify this? I am trying to learn slope-intercept form by myself. Can you help me understand it?

Click here to see answer by ReadingBoosters(3246) About Me 

Question 682853: Please help with these:
1.solve -3< 2x +5≤15
2.if f(x)= -x+2x then what is the value of f(-2)
I have the answer to number 1
x=5
for number 2 I have f=-2
Please tell me if I am right or wrong.

Click here to see answer by ReadingBoosters(3246) About Me 

Question 683468: What expression is equivalent to 3x2(x + 8) + x2?
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Question 684472: 36^1/2 over 15^2
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Question 684473: 3x^2y^4z^-2 over 6x^-1y^3z^-3
Click here to see answer by ReadingBoosters(3246) About Me 

Question 684954: a family refers to a group of two or more people related by birth, marriage, or adoption who resides together. In 2000, in country A, the average family net worth was $210,000, and there were about 8.1*10x7 families. Calculate the total net worth in country A in 2000
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Question 684965: 6
_________
x-1 greater or equal to 1

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Question 685172: Evaluate and get exact answer for:
+10%5Ex+%2B+10%5E%28-x%29+=+48+

Click here to see answer by Alan3354(69443) About Me 

Question 686102: The second of two numbers is 4 times the first. Their sum is 45 . Find the numbers. So far I have came up with 4x + x = 45. I think one of the numbers is 9. The answer choices that I have include 9,36 and 9,15.
Click here to see answer by MathTherapy(10555) About Me 

Question 686741: simplify the expression 7x+14y over 3x+6y+nx+2ny by first factorizing the numerator and the denominator
Click here to see answer by Edwin McCravy(20060) About Me 

Question 687088: I have the find the LCD and then find equivilant fractions to the fractions.
(4a+1)/(7a^(3)),(5a-1)/(49a)

Click here to see answer by funmath(2933) About Me 

Question 687154: HOW DO I WORK 6 3/10 + 3 2/5=
Click here to see answer by josmiceli(19441) About Me 

Question 687147: (X2-3x+7)+(3x2+5x-9)
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Question 687199: find the x and y intercepts of 2x+4y = -8
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Question 687210: Can you help me to simplify: 5/4+2/x?
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Question 687339: simplify 15+(-5)-2-(-8)+(-12)
Click here to see answer by jim_thompson5910(35256) About Me 
Question 687339: simplify 15+(-5)-2-(-8)+(-12)
Click here to see answer by MathLover1(20850) About Me 

Question 687638: 20x^2-125y^2 = ??
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Question 688276: the distance in feet traveled by a free-falling object in t seconds is given by the formula d(t)=16t^2. It takes 8 seconds for a hard hat to fall from the top of the building. How high is the building?
Click here to see answer by Alan3354(69443) About Me 

Question 688559: 8(1+4p)=136

Click here to see answer by rfer(16322) About Me 

Question 689328: Can you solve the equation: 2x-4+3x+5=2x-2
My work so far...
=2x-4+3x+15 = 2x-2
=5x+11 = 2x-2
=3x+11 = -2
After that I am lost because I dont know what move to do next or if I messed up along the way. Please help!

Click here to see answer by Alan3354(69443) About Me 

Question 689330: Simplify: 4-2[7-(3y-5)]
So far I have...
=4-2[7-3y+5]
=4-2[12-3y]
=4-24[-6y]
=4-144y
Is this correct? I dont know if I need to simplify anymore or if I went wrong along the way to solving it. Please help.

Click here to see answer by lynnlo(4176) About Me 

Question 689360: Can you please help me solve the following quadratic equation using the quadratic formula?
2x^2+5x-3=0

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Question 689600: what is the solution to 8+2w+6+w . this is a question that involves combining like terms

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Question 689735: If you can travel only 35 miles per hour, is 2.5 hours enough time to get to a concert that is 85 miles away?

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Question 690158: 5+4i/4-i
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Question 690158: 5+4i/4-i
Click here to see answer by ReadingBoosters(3246) About Me 

Question 690881: 3(1-2x)^2-(x+2)
Click here to see answer by Alan3354(69443) About Me 

Question 690955: Evaluate (2p)^-6
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Question 691173: multiply any number by three
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Question 691331: how i solve this parenthese?

2(xy+2x+2y+2)=

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Question 691688: find y
a(y-a)-2b(y-3b)= ab

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Question 691851: 16^(5/4)
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Question 691851: 16^(5/4)
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Question 692481: Factor: 4x^2-25z^2
Click here to see answer by jim_thompson5910(35256) About Me 

Question 692502: Factor: 2x^2-11x+15
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Question 692502: Factor: 2x^2-11x+15
Click here to see answer by MathTherapy(10555) About Me 

Question 692568: can you please help me solve the following equation
-3m+2(2+2m)=-1

Click here to see answer by josh_jordan(263) About Me 

Question 692996: 40 + 2x = 60 - 3x
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Question 693650: What are two word phrases for variable expression such as 8+b
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Question 694027: 0.4x – 0.2(3 – x) – 1.8 With the written out steps thanks
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Question 694027: 0.4x – 0.2(3 – x) – 1.8 With the written out steps thanks
Click here to see answer by JBarnum(2146) About Me 

Question 694323: Marty recently bought 6 notebooks, 5 pens, and 4 markers. A notebook costs 5 cents less than a pen and 10 cents less than a marker. Write an expression that describes how much money Marty spent if a notebook costs n cents.
Click here to see answer by ptaylor(2198) 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