Answer:
Step-by-step explanation:
Represent the number by x. Then:
9x - 4 = 23
1. The answer is 1. To get this answer, substitute x=3 into the function and solve for f(x)
2. The answer is 12. Substitute -5 in place for f(x) and isolate and solve for x.
**Please mark this answer as Brainliest and leave a Thanks if I helped :)
When the firecracker hits the ground, H(t) = 0.0 = -16t^2 + 90t + 160 Using the quadratic formula,t = (-90 +- sqrt(90^2 - 4(-16)(160))) / 2(-16)t = -1.42 ort = 7.04
The negative time is extraneous. Therefore,t = 7.04 s.
Seven Seconds is your answer!
