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y = 2x + 5 y = 4, therefore 2x + 5 = 4 2x = 1 x = 1/2

a² + b² = c²

a : 9       b : unknown      c: 15

b² =c² - a²

so b² = 225 - 81

=144 so b=12

42 x 5 = 210.

45+29+63+42 = 179.

210 - 179 = 31

X = 31

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This question is testing your understanding of speed, distance and time and sounds much more complicated than it actually is. For a question like this one, it is best to draw a picture to help you get a b...