You have to set x to itself but there are 2 x so you have to set one to the other side, normally you will switch the smallest one in this case it is -13x so since its a negative lets add it t both sides(the only way to get rid of a negative is with a positive and what you do to one side you have to do it to the other) now you have -1x+7=13 you have to subtract the 7 to leave x by itself this gives you -1x=6, now finally divide by -1 in both sides(because the only way to get rid of a multiplication is with a dividion) this will result in x=-6
Hope this helps
Answer:
$9.03
Step-by-step explanation:
Using x for pay rate
63.24=7x Divide both sides by 7
x=9.03
Answer:
66 nickels = 66 x $0.5 = $3.30
$7.80 - $3.30 = $4.50
$4.50 / $0.10 = 45
Brielle has 45 dimes.
The given expression is in the form (a+b)(a-b) where
a = 5
b = sqrt(3)
Recall that
(a+b)(a-b) = a^2-b^2
is the difference of squares formula
If a = 5, then a^2 = 25
If b = sqrt(3), then b^2 = (sqrt(3))^2 = 3
The squaring undoes the square root. The two opposites cancel out.
So using a^2 = 25 and b^2 = 3, we can say
(a+b)(a-b) = a^2-b^2 = 25-3 = 22
Therefore,
(5+sqrt(3))(5-sqrt(3)) = 22
Answer: B) 22