Answer:
200 words are peter can be type in 5 minutes.
Step-by-step explanation:
As given
If peter can type 80 words in 2 minutes .
i.e
80 words = 2 minutes
Now words type in 1 minutes.
1 minutes = 40 words
Now calculate number of words are type in 5 minutes.
Words are type in 5 minutes = Number of minutes × Number of words are type in 1 minutes.
Number of minutes = 5 minutes
Number of words are type in 1 minutes = 40 words
Words are type in 5 minutes = 5 × 40
= 200 words
Therefore 200 words are peter can be type in 5 minutes.
The statement which best compare the mold growth rates is: C. the mold growth rate of the banana bread was half the mold growth rate of the whole wheat bread.
<h3>How to compare the mold growth rates?</h3>
First of all, we would determine area of mold growth B(t) on the piece of banana bread by using this equation:
B(t) = 20(1.06)^t
At t = 1, we have:
B(t) = 20(1.06)^1
B(t) = 21.2 mm².
At t = 2, we have:
B(t) = 20(1.06)^2
B(t) = 22.47 mm².
At t = 3, we have:
B(t) = 20(1.06)^3
B(t) = 23.82 mm².
At t = 4, we have:
B(t) = 20(1.06)^4
B(t) = 25.25 mm².
Now, we can compare the mold growth rates by using this expression:
B(t) = xW(t)
x = B(t)/W(t)
x = 21.2/40.8
x = 0.5.
At t = 2, we have:
x = 22.47/41.62
x = 0.5.
At t = 3, we have:
x = 23.82/42.45
x = 0.5.
At t = 4, we have:
x = 43.30/25.5
x = 0.5.
Read more on growth rate here: brainly.com/question/9479649
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So we have the following system of equations:
We need to solve it by substitution. This means that we have to take the expression for x given by the second equation and replace x with it in the first equation:
So y=-1. If we use this value in the second equation:
So we have x=2 and y=-1 which means that there's one solution. Then the correct answer is A and the solution is (2,-1).
(3) has answer 7 and (4) is sqrt(32).