D + q = 40
.10d +.25q= $7.75
d +q = 40
d =40-q
.10(40-q) +.25q= $7.75
4 - .10q + .25q =7.75
4 +.15q =7.75
4-4 +.15q =7.75-4
.15q= 3.75
.15q/.15 = 3.75/.15
q = 25
d =40-25
d = 15
Check
.10(15) +.25(25)= $7.75
1.5+6.25=7.75
7.75=7.75
Answer:
the answer is b i tuck the text
Step-by-step explanation:
Using the disk method, the volume would be

That is, you split up the solid into disks of some small height ∆<em>x</em>, and each disk has radius at point <em>x</em> equal to the distance (√(<em>x</em>)) from the axis of revolution (the <em>x</em>-axis, <em>y</em> = 0) to the curve <em>y</em> = √(<em>x</em>). The volume of such a disk is then <em>π</em> (√(<em>x</em>))² ∆<em>x</em>. Take the sum of these volumes to get the total volume, then as the heights get smaller and smaller, replace ∆<em>x</em> with d<em>x</em> and the sum with the integral.
Divide b by a in each table to find the constant of proportionality:
A)
14/2 = 7
35/5 = 7
The constant is 7
B)
360/3 = 120
600/5 = 120
The constant is 120
C)
3/75 = 1/25
8/200 = 125
The constant is 1/25
D)
10/4 = 5/2
15/6 = 5/2
The constant is 5/2