Interest earned: $84
Principal: $600
Interest rate: 7%
Time: ?

2 years

Step-by-step explanation:

The simple interest formula is equal to -  A = P (1  + rt)  Where:

A is the Final Investment Value

P is the Principal amount of money to be invested

r is the rate of interest  

t is Number of Time Periods

In this problem we have:

t = ? years

P = $600

A + $600 + $84 = $684

r = 0.07

A substitute in the formula above would be:

$684 = $600(1 + (0.07)t)

solve for t :

t = [(684/600) - 1]/0.07 = 2 years

"if it is my birthday, then it is snowing"

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation: