An electronic repair shop offers three types of service: on-site at-store and by mail. On site service costs 3 times as much as at-store service. By mail service costs $10 less than at store service. Last week the shop completed 15 services on site, 40 services at store and 5 services by mail for total sales of $2650. PART A: define variables for each service

PART B: write systems of equations for the services

PART C: Determine the cost of one on site repair service (SHOW ALL YOUR WORK)

PLEASE HELP ILL MARK BRAINLIEST DUE BY 11:59 P. M.

Divide. reduce the answer to lowest terms.5 2/3 ÷ 3 1/9

Eric has challenged himself to walk 24,000 steps in 4 days. if eric walks the same number of steps each day, which function represents the number of steps eric still needs to walk to reach his goal with respect to the number of days since he started his challenge? a. y = 8,000x − 24,000 b. y = -8,000x + 24,000 c. y = 6,000x − 24,000 d. y = -6,000x + 24,000

In a test for esp (extrasensory perception), a subject is told that cards only the experimenter can see contain either a star, a circle, a wave, or a square. as the experimenter looks at each of 20 cards in turn, the subject names the shape on the card. a subject who is just guessing has probability 0.25 of guessing correctly on each card. a. the count of correct guesses in 20 cards has a binomial distribution. what are n and p? b. what is the mean number of correct guesses in 20 cards for subjects who are just guessing? c. what is the probability of exactly 5 correct guesses in 20 cards if a subject is just guessing?