book Maths Puzzle Numerical Ability

1. Write a formula that describes the function for: A large pizza costs $12.00 plus 30 cents for each topping. Express the total cost C as a function of the number of toppings t.

2. Graph 5y - 3x >= 25

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book Other Question

A power boat has a 4 hour supply of gasoline. How far can this boat travel from the marina if the rate out against the current is 40 km/h and the rate back in with the current is 60 km/h? Can anyone answer this?
There are two spinners, one is divided into thirds with green,
yellow and blue. The second spinner is divided into fourths with
blue, yellow, red and white.
find the theoretical probability of spinning blue on both.</PRE>