i need help with question 4 and 5 please

Question 4 8 pts 4. Convert 105 inches into nanometers(nm), (1inch=0.0254 m). Write the answer in scientific notation with the correct number of significant figures. 2.67 x10nm 2.66 x108 nm 2.67 x10 nm 4.13 x1011 nm D Question 5 8 pts 5. An element has 2 naturally occurring isotopes with the following masses and percent abundance. Calculate the atomic weight of the element. What is the element? Isotope mass Percentage 62.93 amu 69.09% 64.93 amu 30.91% 63.55 amu, Copper 65.38 amu, Zinc 58.70 amu, Nickel 62.02 amu, Brass