Please help hard math:: Samuel started the 30-day challenge on the same day that Greg did. He could do 15 pushups on the
first day, and he sets a goal to do 2 additional pushups every 3 days.
2. Write the equation that describes the relationship for the number of pushups Samuel does,
s(d), in terms of d days.

Anyone know? is appreciated! will mark brainliest if correct!

Find an equation for the linear function which has slope -10 and x-intercept -7

Four airplanes carrying a total of 400 passengersarrive at the detroit airport. the airplanes carry, respectively,50, 80, 110, and 160 passengers.a) one of the 400 passengers is selected uniformly at random.let x denote the number of passengers that were on theairplane carrying the randomly selected passenger. find var(x)for x as given in the problemb) one of the 4 airplane drivers is also selected uniformly atrandom. let y denote the number of passengers on the chosen driver’s airplane. find var(y) for y as given in the problem