Answer:
A)
is the expression to represent total amount of money she earns babysitting for Smith family.
B)
she will earn for Smith family for 7 hours
C) It would take
for Margie to make
when babysitting for the Smith family
Step-by-step explanation:
Given.
Mr. and Mrs. Smith pay Margie
an hour to babysit their son, Shea.
Mr. and Mrs. Jones pay Margie $8 an hour to babysit their children, Sarah, Susan, and Dawn.
Let x be number of hours.
Solving for Part A.
Amount of Money earn from Smith family = Pay per hour
Number of hours =
Solving for Part B.
x=7
Margie earns from smith family for 7 hours = 
Solving for part C.
Margie earned = 
To find number of hours
No of hour Margie has done babysitting for Smith family
I think it is C) i am sorry if i am wrong
Answer:
70.01
steps by-step explanation:
If x ≡ 7 (mod 20), then
x ≡ 7 ≡ 27 ≡ 47 ≡ 67 ≡ 87 ≡ … (mod 20)
or equivalently, x = 7 + 20k for some integer k.
Taken mod 4, we have
x ≡ 7 + 20k ≡ 3 (mod 4)
and mod 5,
x ≡ 7 + 20k ≡ 2 (mod 5)
so that a = 3 and b = 2.