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$y(t)=20+70(1.071)_{-t}$

Substitute$t=15$

$y(15)=20+70(1.071)_{-15}$

UseCalcUse a calculator

$y(15)=45.01819…$

RoundIntRound to nearest integer

$y(15)≈45$

b

$y(t)=20+70(1.071)_{-t}$

Substitute$t=30$

$y(30)=20+70(1.071)_{-30}$

UseCalcUse a calculator

$y(30)=28.94157…$

RoundIntRound to nearest integer

$y(30)≈29$

c

$y(t)=20+70(1.071)_{-t}$

Substitute$t=10$

$y(10)=20+70(1.071)_{-10}$

UseCalcUse a calculator

$y(10)=55.25358…$

RoundIntRound to nearest integer

$y(10)≈55$