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3 years ago

5x – 12 = 13 8(x + 3) = 64 using algebra

2 answers:

7 0

stop using my information please !! i thought my family member asked for brainly but she told me nvm and you have my email address ? how ? but please report this guys !! it isn’t me i can get in a lot of trouble.

loris [4]3 years ago

3 0

Answer:

A) 5 and B) 5

Step-by-step explanation:

A) 5x-12=13

+12 +12 (add 12 to the 13)

5x=25

(then divide 25 by 5 which is 5 so the answer is 5)

B) 8(x+3)=64 (first use distributive property)

8x+24=64

-24 -24 (then subtract 24 to 64 which is 40)

8x=40

(then divide 40 by 8 which is 5 so that is it!)

I believe this is correct, I hope this helps :D

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2 years ago

In preparing a certain ointment, a pharmacist used 28.35 g of zinc oxide instead of the 31.1 g called for. Calculate the percent

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Answer: 9.70%

Step-by-step explanation:

The formula to find the percentage error is given by :-

$\%\text{ error}=\dfrac{|\text{Estimate-Actual}|}{\text{Actual}}\times100$

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Estimated mass of zinc oxide used by pharmacist =31.1 g

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3 years ago

Simplify the expression. Write the answer using scientific notation.

bonufazy [111]

Answer:

C. 2.5×10^-27

Step-by-step explanation:

(2×10^-13)^-2 = 2^-2 × 10^(13×(-2)) = 1/4 × 10^-26

= 0.25 × 10^-26 = 2.5 × 10^-27

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Your scientific or graphing calculator can compute and display this for you.

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3 years ago