21. Simplify: 2(5)2 – 6(-2)3 + (3 –
7)3
22. How many different lengths of diagonals does a
regular decagon have?
23. Give the solution set for 3[7 – 2(7x – 4)] = -42x + 45
24. Paul is 20 years older than Jason. In 12 years, Paul
will be twice as old as Jason will be then. How old is Paul now?
my solution:
25. Karen jogs every morning while Roy cycles on the
same route. If Roy’s speed is three times that of Karen and Roy starts 2 hours
after Karen, how long does Roy cycle before she overtakes Karen?
26. Subtract 2a2
+ 2ab – ac from the product of a
+ b and 2a – b + c.
27. A cylindrical container with radius 10 cm is filled
with water to a height of 2 cm. The water is poured into a second cylindrical
container with radius 4 cm. How high will the water be in the second container?
29. ABCDEFGH
is a regular octagon. What is the measure of ∠BAD?
30. Given rectangle ABCD,
let E be the midpoint of side AB and F the midpoint of side BC.
What part of the rectangle ABCD is
triangle DEF?
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