Suppose f(x, y)=x/y, p=(−1,4) and v=4i−1j. a. find the gradient of f.∇f=i+ jnote: your answers should be expressions of x and y; e. g. "3x - 4y"b. find the gradient of f at the point p.(∇f)(p)=i+ jnote: your answers should be numbersc. find the directional derivative of f at p in the direction of v. duf=note: your answer should be a numberd. find the maximum rate of change of f at p. note: your answer should be a numbere. find the (unit) direction vector in which the maximum rate of change occurs at p. u=i+ j

At river bank, checking account customers earn 0.75% interest a month on their account balances, pay no service fees for writing checks, and pay a monthly $2.00 financial charge. calculate the income earned in one month on the checking account for a customer with an account balance of $1,000. a. $4.25 b. $5.50 c. $6.75 d. $7.25 checking account earnings at baker’s bank are expressed by the equation: i = -0.09x + 10.2. while the earnings at elite bank are modeled by: i = -0.02x + 7.5. in both cases, x is the number of checks written. at what number of checks will elite bank start generating more checking account income than baker's bank? a. 12 b. 25 c. 39 d. 42 emilio’s checking account had a balance of 728.32 at the beginning of the week. he wrote checks for the following amounts throughout the week: $99.48, $33.50, $18.23, and $72.05. he also deposited his paycheck in the amount of $1,109.90. what is his account balance at the end of the week? a. $1,192.35 b. $1,222.86 c. $1,540.52 d. $1,614.96