D/dx 0∫x √1+a^3 da i need help badly

The valve seat performs two functions: it provides a seal for the valve in the combustion chamber, and it provides a cool surface to carry heat away from the valve. most valves use a seating angle.

Solve this system of equations using the elimination method?

Melissa is fearful of men and refuses to go on dates. her therapist suggests that she is fearful because she was sexually abused when she was young. the therapist's suggestion most clearly reflects a perspective. a.) humanistic b.) behavioral c.) biological d.) psychoanalytic e.) sociocultural