We are given that
.
Substitute x with 5-x, then the above equation becomes:
, that is
So, we have the following system of equations:
i)
ii)
multiply the first equation by -4, so that we eliminate f(5-x)'s
i)
ii)
adding the 2 equations side by side we have:
expanding the binomial, and collecting same terms we have:
dividing by -5:
dividing by 3:
Answer:
Answer:
First,
the age of the son: s
the age of the father is 2 less than 7 times the age of his son: 7s - 2
In 3 years, the sum of their ages will be 52, In 3 years, the age of the sun will
increase 3, so s+3. Also, the age of his
father also increase 3, (7s-2)+3
(s+3)+ [(7s-2)+3] = 52 is the equation.
Answer: 11
Step-by-step explanation: because I said so.
An ant on the ground is 22 feet from the foot of a tree. She looks up at a bird at the top of the tree, and her line of sight makes 30 degrees with the ground. How far is she from the top of the tree? (Hint: Find x.)
33.6 feet
Answer:
-8
Step-by-step explanation:
(7)*(-8) = -56
(-56) - (-8) = -48