7
it is 10 times larger (of the number that was multiplied by 10 or added a zero at the end)
((2n + 8)) x 5 = 6n + 12ie 10n + 40 = 6n + 124n = -28n = -7(both equations total -30)
kl
6
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
The sum is the total when numbers are added together, the product is the total when they are multiplied.
17 and 7
there are 12 boys in the class
it is 10 times larger (of the number that was multiplied by 10 or added a zero at the end)
6x + 18 = 4 - x 7x + 18 = 4 7x = -14 x = -2
4(8+2x)=5x+1132+8x=5x+118x-5×=11-323x=-213 3=-7Therefore the number is -7
((2n + 8)) x 5 = 6n + 12ie 10n + 40 = 6n + 124n = -28n = -7(both equations total -30)
Let the number be x: 2(2x+4) = 3x+4 4x+8 = 3x+4 4x-3x = 4-8 x = -4
-313
kl
The way in which numbers are grouped when added or multiplied does not change the sum or product.
7(a+3)