Let a ( x ) = ∫ x f ( t ) d t , where f is continuous and differentiable.
find f ′ ( c ), if c is an inflection point of a . (use symbolic notation and fractions where needed.)

Name the most appropriate metric unit for each measurement like a length of an carrot

Adj has a total of 1075 dance and rock songs on her system. the dance selection is 4 times the size of the rock selection. write a system of equations to represent the situation.

Bob the builder is making 480kg of cement mix. this is made by cement, sand and gravel in the ratio 1: 3: 4