Answer:
13 weeks
Step-by-step explanation:
1. $400-$75= 325
2. 25w=325 (because you save $25 a week)
3. w=325/25
4. w= 13 (325 divided by 25 is 13)
Answer:
8 and 3/4 of a chore
Step-by-step explanation:
She needs to earn 13.50-$3=10.50
Divide 10.50 by 1.20 to get the amount of chores she needs to do.
The answer is 8 and 3/4 of a chore
Answer:
x ∈ {-a, -b}
Step-by-step explanation:
1/(a+b+x) = 1/a +1/b +1/x . . . . given
abx = bx(a+b+x) +ax(a+b+x) +ab(a+b+x) . . . . multiply by abx(a+b+x)
(a+b)x^2 +(a+b)^2x +ab(a+b) = 0 . . . . . subtract abx
x^2 + (a+b)x +ab = 0 . . . . . divide by (a+b)
This is a quadratic equation in x. It will have two solutions, as given by the quadratic formula.
x = (-(a+b) ±√((a+b)^2 -4(1)(ab))/(2(1)) = (-(a+b) ± |a -b|)/2
Without loss of generality, we can assume a ≥ b, so |a -b| ≥ 0. Then ...
x = (-a -b -a +b)/2 = -a
x = (-a -b +a -b)/2 = -b
There are two solutions: x ∈ {-a, -b}.
Answer:
D.
Step-by-step explanation:
I assume you mean 
. Simply plugging in numbers will give you points that match up with the graph. 
and 
when x = 1 and x = 2 respectively.
