Jesse won his race by 3 45/100 seconds. what is this number written as a decimal

Agreeting card company can produce a box of cards for $7.50. if the initial investment by the company was $50,000, how many boxes of cards must be produced before the average cost per box falls to $10.50?

Which statements about these triangles is true

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