20 POINTS PLZ HELP
1 answer:
You might be interested in
Answer:
10x + 50 = 90; 4 hours
Step-by-step explanation:
Let
x -----> the number of hours
y ----> the total charge
we know that
The total charge is equal to the number of hours multiplied by the rate of $10 per hour plus a flat fee of $50
so
The linear equation that represent this problem is
For y=$90
substitute in the equation and solve for x
Subtract 50 both sides
Divide by 10 both sides
therefore
10x + 50 = 90; 4 hours
Remark
Using brackets, as the question has, each of the minus signs is part of the 4. That means you have 2 minus signs in total. They are multiplied together.
Two minus sign's = a plus.
Argument
D is wrong.
The power is not made minus. That would be an entirely different problem. The power and the base have been interchanged. So D has 2 mistakes.
B is also wrong for the same reason.
The power and base have been interchanged. The fact that there are or are not brackets does not make any difference.
A is wrong.
There is only one minus sign given. That cannot happen when there were two to start with.
Answer C.
The two minus signs are preserved. The 2 as a power affects both minus signs.
affects both of them.