exam
Maths Puzzle
Numerical Ability
Frederique is 2 years older than her brother. 12 years ago she was twice as old as he was. How old are they now?
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exam Other Question
find an equation for the line with slope 1/2 and y-intercept of 3
This is what I did:
y=mx+b
y=1/2x+3
y-1/2 =3
2y-x=6(divided both sides by 2)
or
-x+2y=6
2000 mosquitoes are placed in a glass container into which an insecticide is sprayed. 2 hours later, only 300 mosquitoes are alive. If the decrease in population follows an exponen