The answers are x=2 and y=5. 2(2)=4. 4+5=8. y=x-7 then is converted into 5=2-7.
Answer:
Gina 2.5 * 1.38 = $3.45
Amy 3.5 * .98 = $3.43
Gina spent more money by .02
Step-by-step explanation:
My answer was wrong, delete this answer or disregard
Answer:
2+2=4 and 3+1=4
Step-by-step explanation:
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For this case we must find an expression equivalent to:

To express in scientific notation we must take into account that the power will be positive, that is, the decimal is run to the right.
We test each option.
Option A:

If we run the decimal 9 spaces to the left we have:

Option B:
We discard it because the exponent is negative.
Option C:

We run the decimal 6 spaces to the right

Option D:

We run the decimal 9 spaces to the right

Answer:
Option D