Find the number of permutations of 10 things taken 7 at a time.

10 P 7. plug into you calculator to solve or use the formula:  

n P r = n! / (n - r)!  

so 10! / 3! = 10x9x8x7x6x5x4x3x2x1 / 3x2x1 = 10x9x8x7x6x5x4 = 604,800.

25 questions , because they start with 100.  

350-100=250 .  

. 250/10=25

step-by-step explanation:

first take off 100, then what x 10 = 250? that is your answer. (25)