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x + y = 10 y = x + 8 so, x + (x + 8) = 10 2x + 8 = 10 2x + 8 - 8 = 10 - 8 2x = 2 x = 1 and y = 9 because y = x + 8 y = 1 + 8 y = 9
3x actually means 3 * x.So we are going to follow BODMAS rule... 3x-5-10 =3*4-5-10 =12-5-10 =7-10 =-3 Here's your answer..
(3 * 3)(2 * 5) (9)(10) 90
2.42 * 10^ 8 m in 3 seconds = (2.42 / 3.00) * 10^8 m / sec =0.806667 * 10^8 m / sec = 8.06667 * 10^7 m / sec