The simple interest i ( in dollars) for a savings account is jointly proportional to the product of the time t (in years) and the principal p (in dollars). after five months, the interest on a principal of $3892 is $92. a) find the constant of variation.
b) what will the interest be after 3 years

Part a) The constant of variation is or

Part b)

Step-by-step explanation:

Part a) Find the constant of variation.

we know that

The simple interest formula is equal to

In this linear direct variation the constant r represent the constant of proportionality

where

I is the Interest 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

substitute the values and solve for r

Part b) what will the interest be after 3 years

in this part we have

substitute the values

24

step-by-step explanation:

the graph shows 30% of students walk. 80 students were questioned, so the number that said they walk is

30% × 80 = 0.30 × 80 = 24

no association

step-by-step explanation:

if you have eyes and you can use them efficiently you can see that it just looks like random dots like do a line of best fit and like they're so spread out it's such a weak association you might as well consider it nonexistent