Write the number equal to 2 tens 15 ones

That table shows measurements (in invhes$ from cubes with different side lengths. which pairs of variables have a linear relationship? check all that apply

Solve this riddle: i am an odd number. i an less than 100. the some of my digit is 12. i am a multiple of 15. what number am i?

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g