A school assembly had 90 students in attendance, and 80% of them were first-graders. How many first-graders were at the assembly
2 answers:
You might be interested in
Answer:
Step-by-step explanation:
We have the exponential function of the form:
And it goes through the points (0, 13) and (3, 832).
Hence, when we substitute in 0 for x, we should get 13 for y. Therefore:
Since anything to the zeroth power is 1, this yields:
So, we determined that the value of a is 13.
So, our function is now:
We will need to determine b. We know that y equals 832 when x is 3. Hence:
Divide both sides by 13:
Take the cube root of both sides:
Hence, our b value is 4.
Therefore, our entire equation is:
Answer:
B: a = 1, b= 7, c = -2
Explanation:
Knowing This:
<u>solve for b</u>
- -b = -7
- b = 7
<u>solve for a</u>:
- 2a = 2
- a = 1
<u>solve c</u>:
- b² - 4ac = 57
- 7² - 4(1)(c) = 57
- -4c = 57 - 49
- -4c = 8
- c = 8/-4 = -2