Follow the order of operations
1. parentheses (13+5) = 18
2. multiplication 21*(13+5) = 21*18 = 378
3. add 9 + 21*(13+5) = 9 + 378 = 387
Hope this helps!
Answer:
x = 11/2
Step-by-step explanation:
Combine like terms to get -4x + 15 = -7
Subtract 15 from both sides to get -4x = -22
Divide both sides by 4 to get x = 11/2
Answer:

Step-by-step explanation:
Given
The attached graph
Required
Calculate the constant of proportionality.
Represent the required constant with k.
Such that:

Pick any two corresponding values of x and y

This means that:

becomes

