I have ten dollars I got an additional two and i spent two. Then I spent another five dollars and my mom gave me an additional 5. How many do I have left??

10

Step-by-step explanation:

Start off with $10. Spent $2 then regained $2 ($10 still). Then spent $5, but got $5 back, so still $10.

step-by-step explanation:

you can add the two numbers and divide the result by 2. or you can find the gap between the two numbers and add half of this to the smaller number.

126.66 m²

step-by-step explanation:

the pertinent area formula is a = πr², where r is the radius.

here, a = π(6.35 m)² = 40.32π, or approximately 126.66 m²