Help please if you can​

Plz hurry evaluate the expression a+b where a=8 and b=19

Type the correct answer in the box. consider the system of linear equations below. rewrite one of the two equations above in the form ax + by = c, where a, b, and c are constants, so that the sum of the new equation and the unchanged equation from the original system results in an equation in one variable.

Find the rate at which the water is now flowing from the tap give your answer cubic centimetres per second