Answer:
2.5 seconds.
Step-by-step explanation:
h(t) = -4t^2 + 20t
= -4(t^2 - 5t)
Convert to vertex form by completing the square:
h(t) = -4[(t - 2.5t)^2 - 6.25]
= -4(t - 2.5)^2 + 25 <--------- vertex form
So the vertex is at the point (2.5, 25).
So the athlete reaches the maximum height ( of 25 feet), after 2.5 seconds.
Answer:
B
Step-by-step explanation:
In the future use desmos graphing calculator and try them all to see if they work.
Answer:
B -1/9
Step-by-step explanation:
(y - 1) / y = 10
y - 1 = 10y
- 1 = 9y
y = -1/9
B for question five bc u have to do length times width and you’ll get the area
Answer:
15 girls
Step-by-step explanation:
In all, there are 7+5 = 12 equal groups of students in the class, that in total make 36 people.
So there are 3 students in each small group.
Answer.
There are 7*3 = 21 boys and 5*3 = 15 girls.
