Whats 1+1+8-3+5-8+4-8+3-5+8-7-7+5+4+3+9+8 +2+14+78+

What is the ratio for the surface areas of the cones shown below, given that they are similar and that the ratio of their radil and altitudes is 4: 3? 23

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible

3x + 4y = 5 x- 3y = -7 solve by substitution