The expression 1.021)^3t represents the interest that a credit union pays on a savings account.

what is the yearly interest rate?

Yearly interest rate would be 6.3%

Step-by-step explanation:

Since, the amount formula of an investment after t years is,

Where,

Expression represents change factor in the investment,

In which, r = annul rate or yearly interest rate,

n = number of compounding periods,

t = number of years,

If change factor is or

Then,

By comparing,

Hence, yearly interest rate would be 6.3%

r(0,90)(x,y) . t(-5,0)

last option

step-by-step explanation:

∆def to ∆d"e"f"

- rotate 90 counterclockwise degrees

- then translated 5 to the left (x --> x - 5)

answer is the last option

first, we define the variables:

x: number of years after 1950

f (x): amount of vinyl sold.

then, with the variables defined, we have:

68594 vinyl records were sold in 1958 > f (8) = 68594

91299 vinyl records were sold in 1961 > f (11) = 91299

38720 vinyl records were sold in 1952 > f (2) = 38720

161743 vinyl records were sold in 1967 > f (17) = 161743

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step-by-step explanation: