If 140% of x is 56, then what is x?

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

Awater holding tank measures 105 m long, 50 m wide, and 8 m deep. traces of mercury have been found in the tank, with a concen- tration of 60 mg/l. what is the total mass of mercury in the tank? answer in units of kg.

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)