Write 0.000064 in scientific notation. Question 5 options:

A)

6.4 × 10–5

B)

6.4 × 105

C)

6.4 × 10–6

D)

0.64 × 10–4

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.

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

Car a and car b were in a race .the driver of car b claimed that his car was twice as fast as car a