Write and equation to solve the problem, "five less than the product of 6 and a number is -23"?

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

The table below shows the height of a ball  x  seconds after being kicked.  what values, rounded to the nearest whole number, complete the quadratic regression equation that models the data? f(x)  =  x2  +  x  +  0based on the regression equation and rounded to the nearest whole number, what is the estimated height after 0.25 seconds?   feet

What numbers are included in the set of integers? what numbers are not included?