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[ianfreddie07]

#73 = answered by zirkoni

72. It's 11kmph. On still water it travels at 55kmph. Going downstream it's 66kmph (22 divided by 0.33 because 20mins = 1/3hr = 0.33hrs), and going upstream it's 44kmph (22 divided by .5 because 20mins = 1/2hr = 0.5hrs)

69. Answer is A. 40. In 4 years, Tom will be 44 years old and Todd will be 14. 14 x 2 + 16 = 44.

68. In coordinates, X is left side, Y is right side. All X values = Domain, All Y values = Range. So it's D.

67. C. Read my solution for 68 and you'll see why it's C.

66. My logic guessed that it's C, but I haven't encountered stuff like this in domain and range. So I could be wrong.

64. I forgot how to solve this one, sry.

58. D. (75 multiplied by 1.3) + (85 multiplied by 1.9)

[zirkoni]

Originally Posted by ianfreddie07

64. I forgot how to solve this one, sry.

Forgot??? You don't really need to remember anything, just use common sense (draw a picture if that helps).

0.79x + 0.23y = 0.71*224
0.21x + 0.77y = 0.29*224

-> x = 192; y = 32