really slow in math have no clue what im doing and need help with two questions please help me ill post them one at a time

Perform the indicated operation: i dont know know how to post the sign for squared but the whole problem is squared 15-3.8-7/-1^2

Question

really slow in math have no clue what im doing and need help with two questions please help me ill post them one at a time

Perform the indicated operation:  i dont know know how to post the sign for squared but the whole problem is squared 15-3.8-7/-1^2

vannah · Answer

11.2+7 is the answer

anonymous · Answer

okay thanks but can u explain to me how you got that because i use a website that figures the problem out for you but when i put that answer into the answer box it doesnt all fit so thats why im thinking what i got is wrong but i want to understand so i can do the next one hopefully

anonymous · Answer

$$\bigg(\frac{15 -24-7}{1^2}\bigg)^{2}$$

Is this the question?