Answer:
A and B
Step-by-step explanation:
Because the surface area is 
BA is the base, so 
also works.
The answer correct answer is 80.5
Answer:
1) the third equation or X/2=2.0
2) 20 bucks
Step-by-step explanation:
for number 1 just plug in the x hi 4 and try to solve it
2) just calculate unit rate by 120/6=20
7.5 km/h
Step-by-step explanation:
Let's assign the speed of Jerry in still air as <em>x </em> (in km/h)
Let's assign the speed of the wind as <em>y </em>(in km/h)
With the wind as Jerry’s back, he takes 10 minutes to get to the library. We can create the following equation. (<em>we are converting the minutes to hours by dividing by 60</em>);
2.5 / (x + y) = 10/60
10x + 10y = 150
x + y = 15
With the wind against Jerry, he takes 15 minutes from the library. We can create the following equation;
2.5 / (x-y) = 15/60
15x – 15y = 150
x – y = 10
We can now solve the simultaneous equation by subtraction;
x + y = 15
x – y = 10
2y = 5
y = 5/2 = 2.5
y = 2.5 km/h
x = 7.5 km/h
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