Help fast please! :)

Solve the system of equations. y= 2x y= x^2 - 15

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is

Beth divided 9 ounces of her granola recipe into 4 equal-sized amounts. she placed the amounts into individual bowls. the fraction 9/4 represents the number of ounces of granola in each bowl. which other number represents the amount of granola beth has in each bowl? (a) 1 1/4 (b) 2 1/4 (c) 1 3/4 (d) 3 3/4 i need !