# Algebra (check my answers)

posted by .

Multiply
-7(2a2 -4) = -14a2 + 28

Multiply
0.5(a + b -5) = 0.5a + 0.5b - 2.5

Factor
bx - by + bz = b(x - y + z)

Combine like terms (simplify)
12x + 4 - 11y - 6x - 9 - y = 6x - 12y - 5

Evaluate the expression
3x2y when x = 3 and y = 5

Write as a fraction and simplify
Z-4

Write using negative exponents
1/64

Multiply and simplify
3-small2 • 3small6 = 81

Divide and simplify
4-small2/4small4 = 16

Divide and simplify
Y/y-5 = 1

Simplify
(2small3) -small2 =32

Simplify
(x-small1 ysmall1) small5 = ysmall5/xsmall5

Write in scientific notation
0.000005 = 5x10 -small6

Write in standard notation
31 x 10small7 =310,000,000

Perform the indicated operations (give your answer in scientific notation)
(5x10small2) x (5.6x10small4) = 2.8x10small6

Solve
X - 2.1 = -7.5
Answer: x = -5.4

Solve
2.3 = -y/2
Answer: y = -4.6

Solve
2 - x = 11 (x - 1)
Answer: x = 13/12

• Algebra (check my answers) -

check # 7 and 9

• Algebra (check my answers) -

Simplify the expression 2√20-3√7-2√5+4√63 please help the is A because nothing change

## Similar Questions

1. ### Algebra

Will someone please check my answers? 1. Multiply. (a^+2ab-b^2)(a^2-7ab+b^2) my answer:a^4-5a^3b-14a^2b^2+8ab^3-b^4 2. Simplify. (p^6)^2 ________ P^8 my answer:p^4 No, you got the first wrong. Recheck . Yes on second.
2. ### Algebra

I have a few questions that I need help with. Solve the radical equation, and check all proposed solutions. 5. x- square root 3x-2=4 I don't understand this problem. Solve and check the equation. 10. (x^2+14x+49)^3/4-20=7 would I have …
3. ### math

2/3 over 10 equals 1.8/r solve for r. (2/3)/10 = 1.8r. First, invert and multiply the denominator; i.e.,10. (2/3)*(1/10) = 1.8/r 2/30 = 1.8/r Now cross multiply. 2r = 30*1.8 2r = 54 Now divide both sides by 2 2r/2 = 54/2 r = 27 check …
4. ### math

can someone check my answers please subtract -7.1-(-8.3)= 1.2 multiply (7.6)(1)(-6) = -45.6 divid 90/18 = 5 find the reciprocal of 1/3 (9-4= 5/3 -15-(-12) ---------- -18-(-18) undefined
5. ### Algebra-Please check

Please check- sqrt of 2x + 15 = x Answers: -5.3 -3.5 -3 5 I think according to my calculations it would be 5, correct?
6. ### Math HELP

I have my answers at the bottom but please do these questions so I can check my answers. Check my answers as well. Subtract these fractions. !Reduce them! 1. 5/7 - 3/10= 2. 11/18 - 5/12= 3. 1/3 - 1/6= 4. 7/12 - 1/16= 5. 7/8 - 3/10= …
7. ### Algebra

Can you please check my work? You have helped other students I know. Thank you:) Multiply -7(2a2 -4) = -14a2 + 28 Multiply 0.5(a + b -5) = 0.5a + 0.5b - 2.5 Factor bx - by + bz = b(x - y + z) Combine like terms (simplify) 12x + 4 -
8. ### English

Now, let's check how well you can use the expressions you've learned. I will distribute handouts. You have to solve the problems. Are you finished?
9. ### algebra

Solve. x/9-1/7=26/63 STEP 1: The LCM is _________ To clear denominators, multiply each side of the equation by the LCM. _______/1 (x/9-1/7)=__________/1 multiply 26/63. STEP 2: Use the Distributive Property. _____/1 multiply x/9 - …