5
Because 4*5=20
and 20-5 = 15
8.29
the product of 15 and a number by its self four times.
3x+32=4x-15 3x-4x=-15-32 x=-47
The number is 9. 4x + 15 = 5x + 6 4(9) + 15 = 5(9) + 6 51 = 51
4x4 = 16 16-5+4 = 15 15-4 = 11
This is a no brainer ... 60! 15+15+15+15= 60
15
No because 15 times pi is an irrational number
240
15 does.
4n+3 = 15 15 - 3 = 12 4n = 12 12 / 4 = 3 (3 X 4) + 3 = 15
Reverse the operations. Start with 19, subtract 4, which leaves 15. Divide 15 by 3, and that is the number you began with.