1) Andrea rents a bike for a day. The rental charges can be determined by

the equation: R = $0.5d, where R is rental charges and dis number of days

she rents the bike. Calculate the unit rate.

$0.5

Step-by-step explanation:

We have been given an equation , where R is rental charges and d is number of days  Andrea rents the bike. We are asked to find the unit rate.

We know that unit rate represents the ratio between two different quantities. Unit rate represents how many units of one quantity are equal to one unit of another quantity.

Let us divide both sides of given equation by d:

Therefore, the unit rate for our given problem would be $0.5, which represents rental charges per day.

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)