Line a and b intersect, forming two adjacent angles, ∠1 and ∠2. if m ∠1= 7x-8 and
m ∠2= 11y+2, find the values of x and y so that a is perpendicular to b.

For each proportion find the unknown number x 1/5/8=×/15

What is the probability of throwing several dice with sum equal to 6 (six)? show the ways of possibilities for sum 6 (as the numerator) and the ways of throwing n dices for n = 1, 2, 3, 4 or 5 as denominator for all the questions to earn full credits. (a)throw one die, (b) throw two dice, (c) throw three dice (d) throw 4 dice, (e) throw 5 dice

Jonathan can type 20 documents in 40 minutes ,and susan can type it in 30 minutes and jack can type it in 24 minutes working together ,how much time will it is take them type the same document