15x because 5 cant go into 15x look at it like this 5 is a bird and 15x is a bee birds and bees are not the same so you cant add them the answer is 15x-5 good luck
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5x10 = 5(5x5) = (5x5) + (5x5) = 50.
no becuse 5x5=25 and 5x115=575
no it is not it has to be like this for it to be a number sentence......... 5x5=25........P.S..25 is the answer
5x5 is 25 5x5 is 25 25x25 is 625
-6x3 + 4x7 - 0.8x2 + x4 - 5x5 = 4x7 - 5x5 + x4 - 6x3 - 0.8x2 = x2 (4x5 - 5x3 + x2 - 6x - 0.8)