4. Which situation can be represented by a true proportion? An alarm on a clock beeped 7 times in 6 seconds and beeped 14 times in 12
seconds.
A signal light flashed yellow 7 times in 28 seconds and flashed red 5 times in 35
seconds.
A car used 3 gallons of gas to drive 72 miles on a highway and used 4 gallons of
gas to drive 72 miles in town.
A store charged $20 for 2 shirts and charged $25 for 3 shirts.

Afruit stand has to decide what to charge for their produce. they need $10 for 4 apples and 4 oranges. they also need $15 for 6 apples and 6 oranges. we put this information into a system of linear equations. can we find a unique price for an apple and an orange?

Maria donates a fixed amount, a, to a charity each month. if she donates $300 in 12 months, what is the equation for a? a. a + 300 = 12 b. a × 300 = 12 c. a × 12 = 300 d. a + 12 = 300 e. a + 32 = 100

An automated water dispenser fills packets with one liter of water on average, with a standard deviation of 5 milliliter. the manual says that after a year of operation the dispenser should be tested to see if it needs recalibration. a year later a number of filled packets are set aside and measured separately. it is found that the average packet now contains about 0.995 liters. does the dispenser need calibration? explain your answer.