Instantaneous rate of change = S'(r) = 8πr
S'(8) = 8π(8) = 64π
Therefore, the instantaneoud rate of change of the <span>surface area with respect to the radius r at r = 8</span> is 64π
X - the number of people who own a smartphone
y - the number of people who own a flip phone
x:y=4:3

500 more people own a smartphone than a flip phone.

2000 people own a smartphone and 1500 people own a flip phone.
Im sorry but for number 1 what kind of math is that what equation are you supposed to use, but looking at the distance of those dots i would go with 8 as the line between c and d are not that close
For this case we must solve the following linear equation:

Adding similar terms from the left side of the equation:

Subtracting
from both sides of the equation we have:

Thus, equality is not fulfilled. So the equation has no solution.
Answer:
No solution
Answer:
The answer is 18
Step-by-step explanation:
Substitute b for -3 and y for 5 so 3*5=15
You then subtract -3 from 15 so a negative minus a negative is a positive so the equation would be 3*5=15--3= 3*5=15+3=18