Answer:
(x) = 
Step-by-step explanation:
let y = f(x) and rearrange making x the subject, that is
y = 5x + 4 ( subtract 4 from both sides )
y - 4 = 5x ( divide both sides by 5 )
= x
change x to
(x) and y back to x, thus
(x) = 
Answer: 2 2/3.
Explanation:
= -7/3 + 5
= 5x3/3 - 7/3
= 5x3-7/3
=8/3
And then I combined the fraction into a mixed fraction. So: 2 2/3. Hope it helped! :)
Answer:
3.5
Step-by-step explanation:
16.8/4.8= 3.5
Answer: C
Step-by-step explanation:

We do not have the radius, but we do have the diameter. A diameter is twice the radius, therefore we can divide the diameter by 2 in order to obtain the radius.

Plug this info into the formula.

Most research claim at least 20 seconds, therefore 5 sec and 10-15 seconds are too less. 30 seconds seems to be the most fitting answer.
Hope I helped :)