Marilyn collects old dolls. She purchases a doll for $450. Research shows the doll's value with increase by 2.5% each year.
1 answer:
Answer:
Step-by-step explanation:
we know that
The equation of a exponential growth function is given by
where
y is the value of the doll
x is the number of years
a is the initial value
r is the rate of change
we have
substitute
What will be the value of the doll in 20 years?
For x=20 years
substitute in the equation
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Answer: Surface area is equal to 200
Volume is equal to 333.33
Step-by-step explanation:
First, let's do surface area.
The surface area of a pyramid is equal to 1/2(perimeter of base)(lateral height) + area of the base
The perimeter of the base is 10(4) = 40; as the base is a square with a side length of 10.
The lateral height is given as 5 cm.
The area of the base is 10(10) = 100.
We can plug those numbers into the equation to get 1/2(40)(5) + 100, which comes out to be 200.
Now for volume.
The volume of a pyramid is equal to 1/3(area of the base)(height).
We already have the area of the base, which is 100.
The height is given as 10 cm.
Plugging those numbers into the equation, we get 1/3(100)(10), which is 1000/3 or about 333.33.
Hope this helps!