Answer:
a. The surface area is
b. The radius is 8 cm
Step-by-step explanation:
The surface area of a beachball is modeled by the function
Where x is the radius of the beachball.
It's given that a beachball of radius 12 cm has a surface area of
This information will allow us to find the value of a by substituting in the model:
Dividing by 144:
a = 1809.56/144
a = 12.57
The model is now:
Now we can solve parts a and b:
a . Find the surface area of a beachball of radius x=15 cm
The surface area is
b. Find the radius of a beachball with a surface area of
We need to solve:
Dividing by 12.57:
Thus:
x=8 cm
The radius is 8 cm
X+(x-5) +(x-10) ...
This adds up to 8x -140 seconds where x is the 1st race time.
This adds up to 44:20 minutes
44mins * 60 sec/min = 2640 seconds + 20 = 2660 seconds cummulative
8x - 140 = 2660 8x =2800 sec
8x = 350 seconds or 4.5mins for the 1st race
Race 2: subtract 5 seconds yields 4 mins 25 seconds
Answer:
A
Step-by-step explanation:
Find the slope using rise/run
This gets you -5/4
Find the y intercept, which is at (0, 3)
This means the equation will be:
y = -5/4x + 3
Looks like it should be D since they spent 0.08 on tickets and get 1.92. Then shirts are $55 so we subtract this from the profit.