First graded homework (due 9/8)
For maximal credit, full working must be shown.
At time t (in years), the price of a gallon of gas is $y(t) . If
10y' = y ,
how long does it take for the price to double? Give your answer rounded to the nearest whole number of years.
Solve the initial value problem
y' + y = et
with y(0) = 1 .
Give an implicit solution to the initial value problem
y'(x) = ( 1 + 4x3) / ( 1 + 4y)
with y(1) = 3 .