As part of an experiment in the science lab, a thermometer was inserted in a solution in order to measure the temperature over time. At 9:15 a.m. the temperature was –17 °C, and at 11:30 a.m. it was –26 °C.
What is the difference between these two measurements?
To find the difference between the two measurements, we subtract the initial temperature from the final temperature.
Final temperature: -26 °C
Initial temperature: -17 °C
Difference = Final temperature - Initial temperature
Difference = (-26 °C) - (-17 °C)
To subtract a negative number, we can change the sign and add the two numbers:
Difference = -26 °C + 17 °C
Difference = -9 °C
Therefore, the difference between the two measurements is 9 °C.
Simplify:
4x + 3 + (-3x) + 7x - 6x
To simplify the expression, combine like terms:
4x + 3 + (-3x) + 7x - 6x
Combine the x terms: 4x - 3x + 7x - 6x = 2x
Combine the constant terms: 3 + 0 = 3
Therefore, the simplified expression is 2x + 3.