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olga nikolaevna [1]
3 years ago
12

Alyssa took a math test with 20 questions and she answered 16 questions correctly. In order get an A she needs to answer at leas

t 90 percent of the questions correctly
Mathematics
1 answer:
Tatiana [17]3 years ago
5 0

Answer:

she got 80% . in order to get 90% she would have had to get 18 questions right

Step-by-step explanation:

20=100%

2=10%

2×9=90%

18=90%

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Answer:

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Step-by-step explanation:

One could run this on a computer and verify the best fit through brute force. The more elegant way is, as usual, to think: What are special values of x for an exponential function? Zero, for starters - anything to the power of zero is 1. The function value for x=0 in the table is 10. Which choices A through D are close to 10 for x=0? Well, (C) and (D), the rest is too far. Next, what is the function value for the next easy one, x=1? The table says 30. Which of (C) and (D) is close to 30 for x = 1. It turns out we can safely exclude (C) because 10.84*1.77 is about 19 and that's way too far from 30. Let's check (D): 8.46*3.51=29.7 - that's quite close. Since there is no other candidate left, I bet my money on (D). Feel free to verify closeness for the other values of x if you are unconvinced yet.  

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3 years ago
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♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️

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