One side of the rectangle is x=2, the other side is 2x-5 Add up all the four sides: (x+2) +(x+2)+(2x-5)+(2x-5)=54 6x-6=54 x=10
#3: suppose the first integer is x, then the second one is x+2 x(x+2)=255 x^2 +2x -255 =0 factor the quadratic equation: (x+17)(x-15)=0 x=-17, which is impossible, or x=15 so the two positive integers are 15 and 17
<span>To find the confidence interval, add and subtract the margin of error from the mean.
With mean 18.7 and margin of error 5.9, you have 95% confidence the answer is between 12.8 and 24.6.</span>