FInd the sum of 5x+20 and the opposite of 20 write an equivalent expression in standard form. Justify each step

Awork system has five stations that have process times of 5, 9, 4, 9, and 8. what is the throughput time of the system?

You have two cards with a sum of -12 in both hands. a. what two cards could you have? b. you add two more cards to your hand, but the total sum if the cards remains the same, (-12).

From the beginning of the day the temperature rose 15 degrees so that by 4 pm it was 87 degrees. what was the temperature at the start of the day