Noal deposited $2300 into a savings account for which interest is compounded weekly at a rate of 2.12%. How much interest will he earn after 7 years?

$ 367.87

Step-by-step explanation:

The formula for Compound interest =

A = P(1 + r/n)^nt

Where

A = Amount after t years

P = Initial Amount Invested = $2,300

t = time in years = 7 years

n = Compounding frequency = weekly = 52 times

r = interest rate = 2.12% = 0.0212

Hence:

A = $2,300(1 + 0.0212/52) ^52× 7

A = $ 2,667.87

Interest calculated as:

Amount - Principal

I = $2,667.87 - $2,300.00

I (interest) = $ 367.87

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.

898.1666667

step-by-step explanation:

5389/6 = 898.1666667