Write an exponential function whose graph passes through the given points (0, - 2) and (- 1, - 4)

y = -2*0.5ˣ

Step-by-step explanation:

general formula for exponential function: y = abˣ

for point (0 , -2):    -2 = a*b⁰ = a * 1 = a

a = -2

for point (-1 , -4):   -4 = (-2) * b⁻¹       b⁻¹ = (-4) / (-2) = 2    

b = 1/2

exponential function:     y = -2*0.5ˣ

70

step-by-step explanation:

2*5=10

4*15=60

60+10=

70

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