Answer:
2a
Step-by-step explanation:
We can combine like terms.
There are 2 'a' s in the expression, so we can rewrite a + a as 2a.
Answer:
a) 
b) $12,000
Step-by-step explanation:
We are given the following information in the question:
The cost C of moving rubble is proportional to the product of the mass M of the rubble and the distance D the rubble must be moved.
This can be written as:
a)


b) It costs 50 dollars to move 1 ton of rubble 1 mile

We have to find cost to move 16 tons 15 miles.
Putting the values in the function:

Thus, $12,00 is the cost to move 16 tons 15 miles.
Answer:
.
Step-by-step explanation:
The formula for finding the area of a rectangle is A = l.w, where A is the area, l is the length and w is the width of the rectangle.
This formula is used to find area when l and w are known.
Now, if area A and length l are known the width w will be given by the formula
.
Therefore, width = area by length. (Answer)
There you go... a. 10
If we add x to both sides, we get rid of the x on the right side which leaves us 1/2x + 2 = 7. (1/2=0.5)
Then if we substract 2 from both sides, we will get 1/2x = 5
If half of x = 5, then the whole of x = 10.
Answer:
Equation in picturee
Step-by-step explanation: