0.00000554 in standard form

Hi my sisters and brothers can tell me the answer because i don’t understand the question

Astore ordered 750 candles a total wholesale cost of $7910.20. the soy candles cosy $12.17 each and thespecialty candles cost $9.58each. how many of each were bought?

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