Use the chain rule to compute the second derivative:

The first derivative is


Then the second derivative is


Then plug in π/4 for <em>x</em> :

Answer:
a. 23
b. 13
c. 13/23
Step-by-step explanation:
a. 23 customers (13 +10) are on plan B (lol)
b. 13 customers on this plan text more often
c. Thus, 13/23 of customers on payment plan B use the phone most often to text
Hope this helps :)
Answer:
Slope:-63
Y-intercept: (0,825)
Step-by-step explanation:
Slope= y2-y1 ÷ x2-x1
321-699 ÷ 8-2
-378 ÷ 6 =-63
Y-intercept:
y=-63x+b
to get b (y-intercept) plug in one of the points and solve.
699=-63(2)+b
699=-126+b
699+126=-126+126+b
699+126=0+b
825=b
Answer:
104%
Step-by-step explanation:
(275 × p) / 100 = 286
((275 × p) / 100) × 100 = 286 × 100
275p = 28600
275p / 275 = 28600 / 275
p = 104
Percent Increase = 104
Answer:
Length = 24 and Width = 81
Step-by-step explanation:
Let Width be W
then Length = W-57
Perimeter of rectangle = 2(Length + Width)
=2 (W-57+W)= 210
4W- 114= 210
4W= 324
W= 81
Then Length = 81-57 = 24