Which of the following expressions is equal to -x2 - 4?​

Somone me i want to know what 18 hours out of 24 hours in a fraction

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years