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The probability they wear glasses is 3/7, which means the probability they don't is 1-3/7=4/7. This means 164 students make up 4/7 of the school. To find the number that wear glasses we need to find how m...

(2+3√2, 0)  and (2-3√2, 0)

First you need to make either the x value or the y value equal by multiplying each equation by a number.

2( 4x + 3y = 4 ) and 3( x + 2y = 2 ) which equals:

Equation 1: ( 8x + 6y = 8 ) and Eq...

15a2+ab-6b2 =(?a+?b)(?a-?b) Factors of 15= 3 and 5 Factors of 6= 2 and 3 If we try (3a+2b)(5a-3b) that gives us 15a2+10ab-9ab-6b2 = 15a2+ab-6b2 therefore the answer is (3a+2b)(5a-3b)

5(x+4)-3(2+3x)

Expand first bracket 

5x+20-3(2+3x) 

Expand second bracket

5x+20-6-9x

simplify

14-4x