Alexis washes 10 1/2 windows in 3/4 hours. At this rate, how many windows can she wash in an hour

Find three consecutive numbers such that the sum of one-fourth the first and one-fifth the second is five less than one-seventh the third

If (x-2) 2= 49, then x could be a. -9 b. -7 c.- 2 d. 5 e.9

How many different three-digit numbers can be formed using the digits 1 comma 2 comma 9 comma 6 comma 4 comma 3 comma and 8 without repetition? for example, 664 is not allowed.