Mathematics for IGCSE & O level - Graphs Of Functions (Section 6 - No. 19)
In the formula D=500 * 1.09^t, if Vivek withdrew the money when it reached $800, what would be the next step to calculate the time spent?
Find the y intercept.
Draw a line at D=800 and see where it intersects the curve.
Find the x intercept.
Find the derivative of the equation.
Explanation
Drawing a line to intersect would allow to estimate the time.
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