N=number
n+12 is the expression
Answer:
option C is correct.
Step-by-step explanation:
The area of triangle with sides a, b and c can be found by using formula

We are given:
a= 20
b=30
c=40
<u>Finding s:</u>
Putting values in the formula and solving:

Now, <u>Finding the area</u>:
Putting values in the formula and solving:

So, option C 290.5 units^2 is correct.
1. is x-20/11
2.is -x+60/2
3.is x=2
4.is x+72
Answer:
27
Step-by-step explanation:
He walked 3 miles an hour. So to find howmany miles he walked in nine hours you would do this: 3x9=27