Question

Please can you help me. Thanks.

Answer 1

$y = ab {}^{x}$
it passes through (0,15) and (2,240)...hence will satisfy the eqn of curve....

$15 = a( {b}^{0} ) \\ a = 15 \\ \\ 240 = a( {b}^{2} ) \\ 240 = 15( {b}^{2} ) \\ b = \sqrt{ \frac{240}{15} } \\ b = 4$
$y = (15)(4 {}^{x} )$

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