Karen is thinking of two numbers. thier difference is nine and thier sum is 17 .what are the numbers?

We can write the 2 numbers as a and b 
we have
a-b= 9  
a+b=17
we will solve the equations by adding them both and we get
2a=26, therefore a= 26/2=13

substitute in any equation and you will get 13+ ? = 17, so b= 4
a=13,  b= 4

I'll do the first one for you. it isn't very hard at all.on number one, you have (50 × 3), which equals 150, and (3 × 3), which equals 9. after you establish that, you add 150 and 9 together. so, (150 + 9) equals 159.this means that 53 × 3 = 159.