Answer:
The numbers are 11 and 32. Add to get a sum of 43, and subtract to get a difference of 21.
Step-by-step explanation:
Answer:

Step-by-step explanation:

utilise the Foil method to expand brackets:
F - mulply the first terms (x and x)
O - multiply the outside terms ( x and -2)
I - multiply the inside terms (5 and x)
L - multiply the last terms (5 and -2)
Then add them as following:

Then combine like terms:

Answer:0.25 or 25%
Step-by-step explanation:
The nephew would need to use division to isolate x giving him $66.50 to spend
The number 9 in scientific notation is 8•10^0