Charissa borrowed $400 from her friend to buy a laptop and it took her 15 months to pay her friend back. how much did she pay her friend back if her friend charged he 5% interest annually?

Step-by-step explanation:

We would apply the simple interest formula which is expressed as

as

I = PRT/100

Where

P represents the principal or amount borrowed.

R represents interest rate

T represents time in years

I = interest after t years

From the information given

T = 15 months. Converting to years, it becomes = 15/12 = 1.25 years

P = $400

R = 5%

Therefore

I = (400 × 5 × 1.25)/100

I = 2500/100

I = 25

The total amount that she would pay her friend back would be

400 + 25 = $425

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.

hello from mrbilldoesmath!

answer:

the domain is the set { -2, 0, 2, 3}

discussion:

the domain is the set of x values in the ordered pairs (x,y). taking the x, or first component, of each ordered pair gives   -2, 0, 2, 3.

you,

mrb