You deposit 4000 into a savings account. the account earns 2.75% simple interest. how long will it take to earn $220 in interest?

From the information given, the deposit is 4000$, interest rate is 2.75%  the final interest amounts to 220$ but the time it will take to earn this interest is unknown. We will assume the interest earned is per annum.

The formula we use is I = Prt

Let simple interest be I which is 220

Let principal sum be P which is 4000

Let interest rate be r which is 2.75 %

Let time be t

We need t,  so we  say t = I / Pr

t =  220  /  4000 * 2.75/100

t = 220 / 4000 * .0275

t = 220 / 110

t = 2

Therefore the time it will take to earn 220 $ interest is 2 years.

lockers 1, 4, 9, 16, 25, 40, and 49 are open

i ran through it by the other answer is wrong

the image is given below

since the options are not given so we draw it from the equation

the given equation is

y = (x-1) (x+4)

y = y² + 3x - 4

the above equation is a quadratic equation which will have two roots. if we draw the graph for it, it will look like this