Solve the following with the correct chemical notation and significant figures. 1.24x10^2 + 2.5x10^3 I used these for exponents.

A scientist obtains the number 0.045006700 on a calculator. If this number actually has four (4) significant figures, how should it ?be written 0.04501 0.4501 0.0450 0.04500

A piece of cardboard is 12.0 cm long, 6.3 cm wide and 0.75 millimeters thick. What is the volume of this piece of cardboard in cubic meters? Enter your answer in the space provided WITHOUT units. Make sure to round your answer to the correct number of significant figures. Please give the number as a normal number, do not use scientific notation.  (In example: a normal number = 4300 instead of the number being in scientific notation as = 4.3 X 103)

A student sets up the following equation to convert a measurement. (The ? stands for a number the student is going to calculate.) Fill in the missing part of this equation. 2 -4.9 × 104 Pa mm² ☐ 2 = ? Pa m x10 • X μ Ś

A medical lab technician measures the mass of cholesterol in a blood sample. The mass is 6.04 × 10 - 5 g. What is the mass in micrograms? Write your answer as a decimal. x10

A student sets up the following equation to convert a measurement. (The ? stands for a number the student is going to calculate.) Fill in the missing part of this equation. (84. cm )· 0= ? m² 3 3

1.19×10^−8s to nanoseconds Express your answer to three significant figures and include the appropriate units.

A botanist measures the thickness of a leaf. The thickness is 2.9 mm. What is the thickness in meters? Write your answer as a decimal. m Ox x10 X Ś