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

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Algebra: Evaluation of expressions, parentheses

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Question 164123: how do i evaluate 9^-3/2?
Click here to see answer by Earlsdon(4900)

Question 164278: referring to questions 163893,159668,159276.I understand grouping like expressions,such as a's go together b's go together c's go together and so on.But when I've tried to work problems I can't tell when I should add and when I should subtract.For example 3a-5-2b+3a+7b-2.My answer was 6a-2-9b.The correct answer was 6a+5b-7.
Click here to see answer by Fombitz(2113)

Question 164407: Hello. I am having a hard time figuring out how to evaluate the following expressions:
4/2 - 3*2squared (I came up with: 4/2 - 3 x 4
4/2 - 12
2 - 12
-10.
(4/2 - 3)*2squared

4/2 - (3*2)squared
Thank you.
Click here to see answer by Fombitz(2113)

Question 164849: The sum of a 2 digit number is 8. When 18 is added to that number the digits get interchanged. Find the number. (7th Std-CBSE)
Click here to see answer by MRperkins(83)

Question 165172: Find the equation, in slope-intercept form, of the line that passes through the points (5, 2) and (-7, 3). Write the equation in slope-intercept form.
Click here to see answer by josmiceli(3013)

Question 165170: Find the slope of the line that passes through the points (-3, -5) and (-5, 1).

Click here to see answer by elima(1433)

Question 165325: Multiply:
(4x + 1)(2x2 + 5x + 1)

Click here to see answer by nerdybill(2448)

Question 165419: Evaluate 5x for each value of x
x=0.3
x=4.8
Click here to see answer by checkley77(7072)

Question 165419: Evaluate 5x for each value of x
x=0.3
x=4.8
Click here to see answer by Mathtut(3670)

Question 165342: 3+5(2x-4)=-7(5x+2)
Click here to see answer by checkley77(7072)

Question 165482: Use FOIL to multiply:
(3x – 8)(x – 7)

Click here to see answer by MRperkins(83)

Question 165482: Use FOIL to multiply:
(3x – 8)(x – 7)

Click here to see answer by Edwin McCravy(2922)

Question 165481: Convert to scientific notation:
0.003816

Click here to see answer by jojo14344(1483)

Question 157358: My daughter has 2 homework problems that she asked for my help on but I am stumped. The directions are to add 3 terms to each pattern and then write an algebraic expression that describes the pattern. She can add the terms to the pattern (see the last 3 numbers in each line below) but we are stumped on the expression that goes with it.
Number 1 - 1, 8, 27, 64, 125, 216, 343
Number 2 - 2, 5, 14, 41, 122, 365, 1094
Thanks for your help!
Click here to see answer by Alan3354(6097)

Question 165694: For f(x) = 3x – 5, find f(2).
Click here to see answer by vleith(1977)

Question 165834: Factor completely:
3x2 + 2x – 8

Click here to see answer by Alan3354(6097)

Question 165837: Factor completely:
x2 – 9x + 20

Click here to see answer by checkley77(7072)

Question 165835: Factor completely:
9x2 – 36y2

Click here to see answer by checkley77(7072)

Question 165830: Perform the indicated operations:
(5x2 – 3x + 2) + (-3x2 + 9x – 8) – (x2 + 3x – 10)

Click here to see answer by checkley77(7072)

Question 166280: n6^2 divided by 4=117 What does n=?
I thought n=-50 but I couldn't find out how to subtract 24 - -50

Click here to see answer by Mathtut(3670)

Question 166297: Evaluate -20 + (14) - 3 + 6
Click here to see answer by stanbon(26297)

Question 166362: Find the product
28. (11x + 3y)(x + 4y)
Click here to see answer by 19952008(1)

Question 166555This question is from textbook
: For which integers a, b, c does a - b -c = a -(b - c)? This question is from textbook

Click here to see answer by jim_thompson5910(13794)

Question 166557This question is from textbook
: Hosni gave the following argument that - (a + b) = -a + -b, for all integers a and b. If the argument is correct, supply the missing reasons. If it is incorrect explain why not.
- (a + b) = (-1)(a + b)
= (-1)a + (-1)b
= -a + -bThis question is from textbook

Click here to see answer by edjones(3298)

Question 166628: Evaluate, -3(5^3-3^3)
Click here to see answer by jim_thompson5910(13794)

Question 166664: addition method
4x-2y=5
24x-9y=-3
by what constant should one of the eauations be multiplied if the x terms are to drop out?
Click here to see answer by jim_thompson5910(13794)

Question 166657: eleven is subtracted form a number and then the difference is multiplied by 5 the result is 30

Click here to see answer by ankor@dixie-net.com(6693)

Question 166767: A rectangle is 5 cm. longer than it is wide. If its length and width both increased by 3 cm. , its area is increased by 60 cm (squared). Find the dimensions of the original rectangle.
Click here to see answer by josmiceli(3013)

Question 166849: The quotient of a number and four increased by seven is negative three
Click here to see answer by jojo14344(1483)

Question 166847: Negative nine increased by three times a number is Negative six
Click here to see answer by jojo14344(1483)

Question 167158: simplify the following algebraic expression: 2k-3+k+4=
Click here to see answer by midwood_trail(310)

Question 167135: i am trying to find the gcf of x2y, xy2
Click here to see answer by midwood_trail(310)

Question 167168: factor completely
3x2 + 2x – 8
Click here to see answer by nerdybill(2448)

Question 167589: what is a binomial expression?
Click here to see answer by jim_thompson5910(13794)

Question 167656: In a certain triangle the measure of one angle is double the measure of a second angle, but is five degress less than the measure of the third angle. If the sum of the measures of the 3 interior angles is always 180 form an algebraic equation to express the problem?
I came up with a+2a-5=180, but this just doesn't seem right to me, could you please help? Thank you.
Click here to see answer by gonzo(654)

Question 167695: simplify
(5x+1)^2(4x-4)^2
Click here to see answer by Alan3354(6097)

Question 167710: simplify:
(3y^3m^-5)^5
Click here to see answer by jim_thompson5910(13794)

Question 167711: is the expression (y^-6/y^_8)^-1 the same as 1/y2 yes or no and why?
Click here to see answer by jim_thompson5910(13794)

Question 167775: Solve using the square root property:
2x2 = 40

Click here to see answer by checkley77(7072)

Question 167787: Solve by completing the square:
x^2 + 6x + 4 = 0

Click here to see answer by jim_thompson5910(13794)

Question 167951: hi i got a problem regarding rational expressions and i need a major help
here's the problem:
X^3 - 1 / 1 -x
thanks!
Click here to see answer by ankor@dixie-net.com(6693)

Question 168516: -5x+13= when x = 3
Click here to see answer by jojo14344(1483)

Question 168536: 2ax-2bx+ay-by
Click here to see answer by midwood_trail(310)

Question 168810: 25-3/7f=19+4/7f
Click here to see answer by checkley77(7072)

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