Someone please help me ASAP

Factorize: x^2+8x+10 i just solved it but i don't know if the process is correct

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

Atheater wants to build movable steps that they can use to go on and off the stage. they want the steps to have enough space inside so they can also be used to store props. how much space is inside the steps?