40% of 280 is 112 so to increase by 25% it must increase by 28
If there are 8 sides to an octagon, that means that there are 4 equal sides remaining. First, we would subtract 70-12=58. 58 is the total perimeter of the four equal sides remaining. We would then divide 58 by 4 to find the length of each side. You should be able to finish this off. I hope this helped!!!
Answer:
I believe the period is 1. Because if it was y= sin2 (2(x-1/2) then the period would be 2.
9 numbers and 5 are even. 5/9 5 divided by 9 is .55 continued. So it would be estimated as 55.5 %