A cylinder is a solid figure with straight parallel sides and a circular or oval cross section with a radius (r) and a height (h). The volume of a cylinder is π r²h and the surface area is 2(π r²) + 2π rh.

To multiply monomials, multiply the coefficients (the numbers that come before the variables) of each term, add the exponents of like variables, and multiply the different variables together.

3a x 7b = (3 x 7) (a x b) = 21ab

A cube is a rectangular solid box with a height (h), length (l), and width (w). The volume is h x l x w and the surface area is 2lw x 2wh + 2lh.

To solve this equation, repeatedly do the same thing to both sides of the equation until the variable is isolated on one side of the < sign and the answer on the other.

5y + 5 < \( \frac{y}{-5} \)
-5 x (5y + 5) < y
(-5 x 5y) + (-5 x 5) < y
-25y - 25 < y
-25y - 25 - y < 0
-25y - y < 25
-26y < 25
y < \( \frac{25}{-26} \)
y < -\(\frac{25}{26}\)

To multiply binomials, use the FOIL method. FOIL stands for First, Outside, Inside, Last and refers to the position of each term in the parentheses.