book Maths Puzzle Numerical Ability

-2[4g-3]+9g=11g-18

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book Other Question

What is the circumference of a circle with a diameter of 30 centimeters?
a)188.4 cm
b) 47.1 cm
c) 94.2 cm
d) 9.55 cm
Use the midpoint formula to find the midpoint of the segment with the following endpoints:
a.(4,.5) and (3,-10)
b.(5,6) and (4,8)
c.(100,100) and (200,200)