P
fllustrative
iva mathema
7. a student on the cross-country team runs 30 minutes a day as a part of her training,
write an equation to describe the relationship between the distance she runs in
miles, d, and her running speed, in miles per hour, when she runs:
a. at a constant speed of 4 miles per hour for the entire 30 minutes

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)

hey! so 1 (25) out of 4 (100) is 25 so your answer is 25%. it's like quarters!

r = 78539458390583095803458309458039485093485 or just 3

step-by-step explanation: