T(t)=70+110e^(-t/2)
After 4 minutes, t= 4
Substituting in the temperature equation,
T(4 minutes) = 70+110e^(-4/2)=70+110e^(-2) = 84.89 oF
Answer:
<u>C</u>: <em>3x + 80 + 2x = 180</em>
Step-by-step explanation:
A straight line is equal to 180 degrees total the find x, you would add the number within the line and make it equal to 180.
3x + 80 + 2x = 180
add like terms
5x + 80 = 180
subtract 80 from each side
5x = 100
divide each side by 5
x = 20
First: work out the difference (increase) between the two numbers you are comparing.
Increase = New Number - Original Number
Then: divide the increase by the original number and multiply the answer by 100.
% increase = Increase ÷ Original Number × 100.
Increase = $10.25 - $9
% increase= $1.25/$9 x 100
% increase=13.888888889
% increase= 14%
Answer:
A)
Step-by-step explanation:
To find the answer we must solve each of the systems separately. Starting with the first one:
x + y = 2
2x - y = 10
We must find what x or y is equal to and then replace it in the second equation. I'll go with y as it seems easier:
x + y = 2
y = 2 - x
Now that we found y we replace it in the second equation this way. Be careful with the signs, the minus with change our signs:
2x - (2 - x) = 10
2x - 2 + x = 10
3x = 12
x = 12/3
x = 4
Now that we have x, we replace the variable with its value in one of the equations. Again, for simplicity I'll go with the one that seems easier.
4 + y = 2
y = 2 - 4
y = - 2
