∠a and ∠b are vertical angles with m∠a=x and m∠b=4x−30 . what is m∠a ?

What is the length of the unknown leg in the right triangle ?

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?

Zahra runs a 500-meter race at a constant speed. which graph shows her distance from the finish line during the race?