Can an answer be incorrect even if it looks resonable explain?

Using the standard Algorithm to Add Greater Numbers.

Daniel expanded the expression as shown below -2(-8x-4y+3/4)=-10x-8y-11/4 what errors did he make? check all that apply

Need this at the city museum, child admission is 6 and adult admission is 9.20. on tuesday, 132 tickets were sold for a total sales of 961.60. how many adult tickets were sold that day?

Find the area between y=e^x and y=e^2x over [0,1]