We need to start from the innermost parenthesis and work our way out.
The first parenthesis is
. These are not like terms because one involves a variable, while the other is a constant term. Two terms are summable if they involve the same power(s) of the same variable(s).
So, we can take one step outwards, and we arrive to the square brackets. We have

and 2z and -13z are like terms, so we can sum them:

Finally we arrive to the whole expression, which is

Because, again, 5z and 11z were like terms.
The answer will be C. the total number of hours Marta spends swimming each visit. Hope it help!
Do 17 divided by 85 and you should get an aproximate answer
Answer:
The correct answer is D. 8
Step-by-step explanation:
In order to find this, solve by multiplying the top equation by -6. Then add the equations together to get the x values to cancel. Then you may solve for y.
-2x - 3/2y = -6
2x - 3y = -30
--------------------
9/2y = -36
y = 8
Answer:
$46.25
Step-by-step explanation:
9.25 times 5 = 46.25