Please help

QUESTION 1 Identify which graph(s) are always increasing. Select all that apply. D a Db QUESTION 2 Determine the critical numbers for the function f (x) = -x3 - 2x2 + 15x + 10. Separate values using commas. QUESTION 3 Find the intervals where the function f (x) = -x3 - 2x2 + 15x + 10 is decreasing. Separate intervals using commas. For negative infinity, write "-inf". For positive infinity, write "inf" Do not include spaces in your response