exam Maths Puzzle Numerical Ability

Equation of change: For the equation of change
df over dx=7f-14, determine whether f is increasing or decreasing when f=1.

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exam Other Question

Suppose you are at the gas station filling you tank with gas. The functions C(g) represents the cost C of filling up the gas tank with g gallons. Given the equation: C(g) = 3.03 How do I find the pattern to the sequence?
1,4,9,1,6,2,5,3,6,4,9,6,4 _,_,_,_
I would also like and explanation how to get the answer so I can explain it to my daughter.