The bottom of a ladder must be placed 7 feet from a wall. The ladder is 9 feet long. How far above the ground does the ladder touch the wall?​

Jackie purchased 3 bottles of water and 2 cups of coffee for a family for $7.35. brian bought 4 bottles of water and 1 cup of coffee for his family for $7.15. how much does each bottle of water cost? how much does each cup of coffee cost? i need this done

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)

If f(x) = 3x2 - 2x+4 and g(x) = 5x + 6x - 8, find (f-g)(x).