Calculate the following and record the answer the the proper number of significant figures. (45.68 – 45.65) x (32.1 + 89.9)

Which of the three major subatomic particles has/have a charge of –1?i.  electronii. protoniii. neutron

If the density of steel is 7.85 g/cm3 and the density of rust is 5.24 g/cm3 calculate the masses of 67.6 cm3 cubes of both materials respectively (one solid cube of steel and one solid cube of rust).

2.7 kilograms contain this many grams.

The temperature in the laboratory is posted as 251 K. What is this temperature in degrees Celsius?

Express the number 178414 in scientific notation.

Convert 22.9 cm to inches (2.54 cm = 1 in).

Convert 77.0°F into Celsius degrees?

Using the rules of significant figures, calculate the following: 30 + 4.207

4.1 milliseconds is equal to how many seconds?