haileysolis5
20.02.2020 •
Mathematics
Freda bought a sandwich for $4.00 and a drink for94$.Her grandson ordered a meal for$6.35.What was the total price of all three items when 8% sales tax was added?Explain how touse estimation to check whether your answer is reasonable
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Ответ:
Total price = $112.70
Step-by-step explanation:
Total price of all three items without tax = 4 + 94 + 6.35
= $104.35
Total price of all three items with tax = (100% + tax) * Price
= (100% + 8%) * 104.35 = 108% * 104.35
= 1.08 * 104.35 = 112.698
≅ $112.70
(2) Explain how to use estimation to check whether your answer is reasonable:
We can use estimation to check if a result is reasonable by plugging in the answer in the original equation.
E.g. x + 4 = 10; x = 10 - 4
We get that x = 6
Plug in x = 6 in x + 4 = 10.
6 + 4 = 10. Indeed the answer was a reasonable one.
Ответ: