I believe the answer you are looking for is -9<span />
Answer:
(20.) D is the correct answer
(19.) A is correct
(18.) A is correct
(17.) D is correct
(15.) A is correct
Step-by-step explanation:
hope this helps u ;)
Answer:
2w+2(2w-7)
Step-by-step explanation:
the first 2w is the length of the two widths, and the (2w-7) is the length of the length, and we multiply by two because there are two sides.
Let ‘s’ be the son’s age 12 years ago.
Let ‘f’ be the father’s current age.
4 years ago, the son was:
s-4
So, his father is currently:
3(s-4)
=
3s-12
Therefore:
f = 3s-12
In twelve years, the son will be:
s+12
And the father will be:
f+12
This can also be written as:
3s-12+12 as the fathers younger age would be f = 3s+12
=
3s
So, we know that s+12 is half the fathers current age, meaning the father is currently 2(s+12) which is equivalent to 2s+24. Also, we know that the father is currently 3 times the sons age 12 years ago, so 3s (proven by the calculations we made above). Therefore, 2s+24=3s which means 24=s. We can then substitute this, and we will receive 24+12 = 36
Son’s current age: 36
We then substitute the son’s age 12 years ago into 2s+24 to give us the father’s age.
2(24)+24 = 72
Father’s current age: 72
