I believe this question should be from an I-Ready test. The answer would be $20.00. Because 70% of 20.00 is 14
It is C. Associative property of multiplication
Answer:
The answer is <u>C. $510.</u>
I have just took the test.
There is a special kind of substitution which some books call it by comparison.
When the two equations are both
y=some function of x
y=some other function of x, then
we can substitute the second equation into the first giving
some function of x = some other function of x and start solving.
For example,
<span>y = –2x + 8
y = x – 1
substitute second into first
x-1=-2x+8
isolate x on left,
3x=9
x=3
second step is to substitute x=3 into second equation to get
y=x-1=3-1=2
Therefore the solution is (3,2)</span>
