easy,161
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2x + 7 + 2x = 23 4x + 7 = 23 4x = 16 x = 16/4 x = 4
This is a common early math question which is attempting to teach "quick math".7 x 23 can be described with the distributive property because 23 can be rewritten as "20 + 3"This means that 7 x 23 can be rewritten as 7 x (20 + 3)THE 7 DISTRIBUTES TO EACH NUMBER AND MULTIPLIES(7 x 20)+(7 x 3) --> 140 + 21 = 161
2520. 84 = 22 x 3 x 7 360 = 23 x 32 x 5 lcm = 23 x 32 x 5 x 7 = 2520
_//(2*2) - 4x - 7// * _//2// = 0 4* 12x - 7 * 122/100 = 0 28*12x * ((28*12)/122) = 0 (23/10 * x) * ((23/10 * x)/122) = 0 23/10 *x = 0 / ((23/10 *x)122) 23/10 *x = 0 23/x = 10 x = 2.3
200 = 23 x 52 175 = 52 x 7 hcf = 52 = 25 lcm = 23 x 52 x 7 = 1400