What is the least angle of rotation that map's the regular heptagon onto itself?

If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if

Julius went on a volunteer trip to centralamerica and took medical supplies with him.he packed a bag with 50 pounds of supplies.he brought pieces of equipment that weighed10 pounds each and bottles of medicine thatweighed pound each prepresents thenumber of pieces of equipment he broughtand b represents the number of bottles ofmedicine he brought then the total weight canbe represented by the equation 10p+b 50.the brought 3 pieces of equipment, how manybottles of medicine did he bring?

Of . 3x+4y+4z=4, 5x+7y+3z=5 4x+5y+7z=7