What is (7.2×10^2)(6×10^-7) in scientific notation?

1 answer:

7 0

Multiply the numbers on the left side of the multiplication sign.

7.2 * 6 = 43.2

Combine the exponents attached to the 10s.

2 + (- 7)
2 - 7
- 5

Your scientific notation should be 43.2 x 10⁻⁵.

As a way to check your answer:

7.2 x 10² = 720 (move the decimal to the right twice)

6 x 10⁻⁷ = 0.0000006 (move the decimal to the left 7 times because it's a negative exponent)

Multiply the two together on a calculator, you get 0.000432. If you move the decimal 5 times to the left on 43.2 (again, because it's a negative exponent), you get 0.000432. The answers match.

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JA mattress store in Stafford purchased a mattress at a cost of $255 and marked it up 100%. Later on, Cassie bought the mattress

goldenfox [79]

Answer:

She pays $566.10

Step-by-step explanation:

The mattress store marks a mattress up 100%. 100% of $225 is 225. We add 225 to 225 and get 510. Therefore, the store sells the mattress for $510 without tax. When Cassie buys the mattress, we have to add 11% tax. We change 11% to 0.11 and multiply that by the selling price (510). We get 56.10, so that is the tax. We add the tax to the selling price and get $566.10. Cassie pays $566.10 for the mattress.

I hope this helped and please mark me as brainliest!

6 0

2 years ago

Which property is demonstrated by the equation (5 + a) + 3 = (a + 5) + 3?

sineoko [7]

Answer:

Communitive Property

Step-by-step explanation:

Commutative property = 2 + 3 = 3 + 2 or 2(3) = 3(2)

Associative Property = (2 x 3) 5 = 2 (3 x 5) or (2 + 3) + 5 = 2 + (3 + 5)

Inverse Property = 2 + (-2) = 0 or (2/1)(½) = 1

Basic Definitions: