p
(
−
4
(
x
−
15
)
x
2
+
2
)
=
256
x
9
−
11520
x
8
+
172800
x
7
−
863424
x
6
−
17280
x
5
+
129600
x
4
−
768
x
3
+
11520
x
2
+
210
Answer:
3/8
Step-by-step explanation:
if 3/4 of the wall is blue
1/2 has posters
the answer is 3/8
because half 3/4 is equal to 6/8
half of 6/8 is 3/8
Think about it. The 80 is the y-intercept meaning that is the starting point or starting height where the rocket is launched from. The purpose of the expression is to show the height of the rocket over time.
Approximately divide the region into 10 vertical strips, each with width of about 1. Next, estimate the y-coordinates of the top and bottom of each strip of this region. For example, the 1st strip stretches from approx. 2 1/4 at the bottom to approx. 2 1/4 at the top, so the total length of this strip is about 4 1/2. Since the area is (width)(height), and the width is approx. 1, the area is (4 1/2)(1) = 4 1/2.
2. Approximate the area of each of the remaining 9 strips.
3. Sum up your 10 approx. areas.