David is buying two CDs. His total before tax is $28.00. If the sales tax rate is 7%, how much tax will he pay?
1 answer:
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Answer:
16.5 cm
Step-by-step explanation:
Using Pythagoras' identity in the right triangle
The square on the hypotenuse is equal to the sum of the squares on the other 2 sides.
let x be the other leg, then
x² + 13² = 21²
x² + 169 = 441 ( subtract 169 from both sides )
x² = 272 ( take the square root of both sides )
x = ≈ 16.5 cm ( to the nearest tenth )