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

Algebra ->  Expressions -> Questions on Algebra: Evaluation of expressions, parentheses answered by real tutors!      Log On


   



Tutors Answer Your Questions about expressions (FREE)


Question 1187345: Check that the following expressions are equivalent using the values x = -2, -1, 0, 1, 2.
(12x^2−27)/ (3) and −(−2x+3)(2x+3)
Prove the equivalence of the two expressions in the previous question above using algebraic manipulation.

Click here to see answer by ikleyn(52832) About Me 

Question 1187451: In the problem:
[-2x - 4]-7
Why must you drop the brackets and be left with -2x-4-7 to attain a correct answer
Would it not be correct to distribute -7 into (-2x-4)?

Click here to see answer by MathLover1(20850) About Me 
Question 1187451: In the problem:
[-2x - 4]-7
Why must you drop the brackets and be left with -2x-4-7 to attain a correct answer
Would it not be correct to distribute -7 into (-2x-4)?

Click here to see answer by Alan3354(69443) About Me 
Question 1187451: In the problem:
[-2x - 4]-7
Why must you drop the brackets and be left with -2x-4-7 to attain a correct answer
Would it not be correct to distribute -7 into (-2x-4)?

Click here to see answer by ikleyn(52832) About Me 

Question 1187494: Write a verbal expression for 2(n + 9).
Click here to see answer by josgarithmetic(39623) About Me 

Question 1187963: Hello
I'm stumped on how to workout this question. Could you please tell me how I go about solving it?
Two Carpenters are building each a small dog house. Carpenter A started building his at 1 pm and ended at 5:30 pm. Carpenter B, being a newbie is more slower than A by half. At what time must Carpenter B start building so that he can end at the same time
with A
Thanks in Advance.

Click here to see answer by ankor@dixie-net.com(22740) About Me 
Question 1187963: Hello
I'm stumped on how to workout this question. Could you please tell me how I go about solving it?
Two Carpenters are building each a small dog house. Carpenter A started building his at 1 pm and ended at 5:30 pm. Carpenter B, being a newbie is more slower than A by half. At what time must Carpenter B start building so that he can end at the same time
with A
Thanks in Advance.

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

Question 1187991: How to express Three-Forth of x in algebraic expression
Click here to see answer by ikleyn(52832) About Me 
Question 1187991: How to express Three-Forth of x in algebraic expression
Click here to see answer by josgarithmetic(39623) About Me 

Question 1188661: I am trying to solve 30= -5 (6x+6). Iv'e tried to do the steps to multi step equations but there ended up being a zero involved
Click here to see answer by josgarithmetic(39623) About Me 

Question 1188735: 5x² + 3
Click here to see answer by Shin123(626) About Me 

Question 1188822: In the following problem:
3(x+4)(x+7)
To obtain a correct solution why must you multiply the binomials
Instead of distributing 3 to the first ? If you do this, it comes up incorrect.

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

Question 1188995: Simplify
( (3√(27x^2y^14)^2)/√(9x^2y^6)^3 ) ^-1

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

Question 1189510: The population of a bacteria colony triples every 4 hours. If the population now is 100, what expression would give me the population of the colony in the future? What is the population of the colony tomorrow at this time?
Click here to see answer by josgarithmetic(39623) About Me 

Question 1189558: I am confused on this Question. Thank you.
What is the same for all exponential equations of the form y = B^x if :
A) the value of B is greater than 1?
B) the value of B is greater than 0 and less than 1?

Click here to see answer by ikleyn(52832) About Me 

Question 1189560: What is the true about 2 exponential graphs of the form y = B^x if the value of B in the first equation is n and the value of B in the second equation is 1/n?
Click here to see answer by ikleyn(52832) About Me 

Question 1189715: There are 3 different triples of(not necessarily distinct) positive integers(a,b,c, d,e,f and g,h,i) such that +a%5E2%2Bb%5E2%2Bc%5E2=d%5E2%2Be%5E2%2Bf%5E2=g%5E2%2Bh%5E2%2Bi%5E2=89+. Evaluate the expression +%28a%2Bb%2Bc%29%28d%2Be%2Bf%29%28g%2Bh%2Bi%29+
Click here to see answer by ikleyn(52832) About Me 

Question 1190369: The height of a rectangular box is 4 times its width, and its length is 6in more than its width. The volume of the box is 47in^3
Click here to see answer by greenestamps(13203) About Me 

Question 1191171: Write a polynomial multiplication statement that is equivalent to
24d2 - 12d.

Click here to see answer by ikleyn(52832) About Me 

Question 1191231: A square with a side length of 2s has a
smaller square inscribed. The vertices of the
smaller square are at the midpoints of the
sides of the larger square.
What is the ratio of the area of the larger square to the area of
the smaller square? Express your answer in
its simplest form

Click here to see answer by Theo(13342) About Me 
Question 1191231: A square with a side length of 2s has a
smaller square inscribed. The vertices of the
smaller square are at the midpoints of the
sides of the larger square.
What is the ratio of the area of the larger square to the area of
the smaller square? Express your answer in
its simplest form

Click here to see answer by ikleyn(52832) About Me 

Question 1191403: 20P1
evaluate

Click here to see answer by ikleyn(52832) About Me 

Question 1191530: Bob age twice that of harrys seven years ago bob was thrice as old as harry
Click here to see answer by Alan3354(69443) About Me 

Question 1191635: -x - (8x) =
Click here to see answer by ikleyn(52832) About Me 

Question 1191654: The distance between Dubai and Abu Dhabi is 138.7km. This distance is 10.7 km more 8 times the distance from Dubai to Al Barsha Park. What is the distance from Dubai to Al Barsha Park?

Click here to see answer by ikleyn(52832) About Me 

Question 1191653: You are buying donuts on zomato. Each donut costs 1.50 aed, and the delivery charges are 3.50 aed. If you have 29 dirhams, how many donuts can you get?
Click here to see answer by ikleyn(52832) About Me 

Question 1191656: You are buying donuts on zomato. Each donut costs 1.50 aed, and the delivery charges are 3.50 aed. If you have 29 aed, how many donuts can you get?
Click here to see answer by ikleyn(52832) About Me 

Question 1192114: Find 3 consecutive numbers such that the sum of the 1st and 3rd numbers exceeds the 2nd number by 10.
Click here to see answer by Alan3354(69443) About Me 

Question 1192113: Two computer technicians both charge a fee for a home visit, plus an hourly rate for their work. Dana charges a $64.95 fee, plus $45/h. Tom charges a $79.95 fee, plus $40/h. For what length of service call do Dana and Tom charge the same amount?

Click here to see answer by ikleyn(52832) About Me 

Question 1192117: a+1/2 = 2a-1/5
Click here to see answer by ikleyn(52832) About Me 
Question 1192117: a+1/2 = 2a-1/5
Click here to see answer by MathTherapy(10555) About Me 

Question 1192116: a+1/2 = 2a-1/5
Click here to see answer by ikleyn(52832) About Me 

Question 1192119: 0.8(2s+3)=-0.6(5s-2)-s
Click here to see answer by MathLover1(20850) About Me 

Question 1192693: There were 32 volunteers to donate blood. Unfortunately, n of the volunteers did not meet the health requirements, so they couldn't donate. The rest of the volunteers donated 470 milliliters each.

Click here to see answer by Alan3354(69443) About Me 
Question 1192693: There were 32 volunteers to donate blood. Unfortunately, n of the volunteers did not meet the health requirements, so they couldn't donate. The rest of the volunteers donated 470 milliliters each.

Click here to see answer by josgarithmetic(39623) About Me 

Question 1192820: Simplify completely, keep answer in radical form.
sqrt(24x^8y^3)/sqrt(75x^-7y^17)

Click here to see answer by ankor@dixie-net.com(22740) About Me 
Question 1192820: Simplify completely, keep answer in radical form.
sqrt(24x^8y^3)/sqrt(75x^-7y^17)

Click here to see answer by greenestamps(13203) About Me 

Question 1194179: If 5x-y is divisible by 4 and 2x+3y is odd. Then 7x+2y is odd for all x,y ∈Z.
Click here to see answer by ikleyn(52832) About Me 

Question 1194180: If 5x-y is divisible by 4 and 2x+3y is odd. Then 7x+2y is odd for all x,y ∈Z. Prove by direct proof or contrapositive
Click here to see answer by ikleyn(52832) About Me 
Question 1194180: If 5x-y is divisible by 4 and 2x+3y is odd. Then 7x+2y is odd for all x,y ∈Z. Prove by direct proof or contrapositive
Click here to see answer by math_tutor2020(3817) About Me 

Question 1194630: The length and width of a rectangle are 8 cm and 6.5 cm. Find the length of a diagonal of the rectangle.
Click here to see answer by greenestamps(13203) About Me 

Question 1195133: If a does not equal to b, and %28%28a%281-b%29%29%2F%28b%281-a%29%29%29%5E%282%29=1, what is the value of %28%28a%2Bb%29%29%2F%28%28ab%29%29?
Click here to see answer by Shin123(626) About Me 

Question 1195760: The population, P of Hazelton has grown according to the model P = 40 000(1. 09) , where t is
t
the number of years since the year 2000.
Assuming the population grows at the same rate, what is the population expected to be in the
year 2022?

Click here to see answer by ikleyn(52832) About Me 

Question 1196204: Evaluate the expression
2|-2|
Evaluate the expression
|-4|-|-16|

Click here to see answer by josgarithmetic(39623) About Me 

Question 1196220: Find A, B and C if
Click here to see answer by josgarithmetic(39623) 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