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3 years ago

Kate paid $27 for a dress that was on sale at 10% off. What was the original price for this dress?

Mathematics

2 answers:

Ivahew [28]3 years ago

6 0

Answer: 29.7

Step-by-step explanation:

Firstly since it’s 10% off, you can figure out how much the discount was easily. Move the decimal left. Your starting number is 27.0 so move it left and it becomes 2.7. That’s how much was taken off. Now you are wondering for full price so, you add 2.7 to 27 and you get your answer.

Art [367]3 years ago

5 0

Answer:

$30

Step-by-step explanation:

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A regular tube of toothpaste costs $2.50 for 3.2 ounces. A travel size tube costs $1.00 for 1.2 ounces. Compare the prices and w

Len [333]

Answer:

The travel size costs 6 % as much as the regular size. Thus the regular size would be more economical and thus a better buy

Step-by-step explanation:

step 1

<em>Find out the unit rate of a regular tube of toothpaste</em>

we know that

To find out the unit rate, divide the total cost by the total weight

$\frac{2.50}{3.2}=\$0.78\ per\ ounce$

step 2

<em>Find out the unit rate of a travel size tube of toothpaste</em>

we know that

To find out the unit rate, divide the total cost by the total weight

$\frac{1.00}{1.2}=\$0.83\ per\ ounce$

step 3

Find out the percent of increase

we have that

The unit rate $\$0.83\ per\ ounce$ represent the 100%

so by proportion

Find out what percentage represent the difference ($0.83-$0.78=$0.05 per ounce)

$\frac{0.83}{100\%}=\frac{0.05}{x}\\\\x=100(0.05)/0.83\\\\x=6\%$

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The travel size costs 6 % as much as the regular size. Thus the regular size would be more economical and thus a better buy

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3 years ago

Element X is a radioactive isotope such that every 66 years, its mass

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Answer:

194.5315427 grams

Step-by-step explanation:

The half-life of element x would be 66 years. So, after 20 years you would have:

.5^(20/66) x 240=0.810548 x 240

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