I had the similar test and got it right so it should be B
Answer:
Formula for the area of a circle;
A = π
Where 'π' represents pi(22/7 or 3.14), and 'r' stands for the radius being squared.
But, we are given a <u>diameter</u> instead of a <u>radius</u>.
So to find the radius of the diameter we must find 1/2(half) of the diameter:
Diameter/2 = Radius
Plug in what we know:
D/2 = R
8/2 = R
4 = R, <u>4 is our radius</u>.
Now we use this radius in our formula;
A = π
A = 3.14(4^2) ← (The symbol ' ^ ' means to the power of.)
A = 3.14(16)
A = <u>50.24 centimetres</u> is the area for this circle.
The answer would be r = -2.
7r + 7 - 2r = -3
5r + 7 = -3
5r = -3 - 7
5r = -10
r = 10/-5
r = -2.
Answer:
both are 79
Step-by-step explanation:
Answer:
It would take 25 minutes for Patrick to complete the project alone.
Step-by-step explanation:
They did the project in 20 minutes, that is, 100% of the project, so:
In which x is the percentage that Patrick worked and y is the percentage that Stewart worked.
Patrick works four times as quickly as Stewart, so x = 4y.
So
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Patrick did 80% of the project in 20 minutes. We can solve this problem by a simple rule of three, in which the time it would take for him to complete the project alone is 100%. So
20 minutes - 0.8
x minutes - 1
It would take 25 minutes for Patrick to complete the project alone.