Answer:
We put the value of the x in the formula

f(6)=

Step-by-step explanation:
Than solve equation.
The answer is 12+3r because 4 times 3=12 then the 3r which you cannot add because they are no others variables that are r
To do this question you can use proportions.
3/60 is simplified to 1/20.
This shows that if you study 1 hour you get a 20. So to find the answer you multiply each side by 4.5, this means that if you study 4.5 hours you get a 90.
Answer: -66d-21 I think.
Step-by-step explanation:
9(-8d-7<u>)</u>+6(d+7)
-72d-63+6d+42 Distributive Property
-72d+6d+-63+42 Combine Like Terms
-66d-21 Answer