Which of the following pieces of laboratory equipment is not directly used to make measurements?
a. test tube
b. graduated cylinder
c. ruler
d. thermometer

Test are not directly used to make measurements, I mean you could use them to put 4 mL of a substance in, but not to measure out 4 mL, like with graduated cylinders. Rulers can be used to measure the length of something, like the number of inches. And a thermometer will help you measure the temperature of something.

8.7 degrees celsius and 15.6 degrees fahrenheit

m=9

step-by-step explanation:

7m+8=71 subtract   8 from 71 which is 63 than divide it by 7m   equal 9.