Coach Khan has to create a volleyball team of 4 students out of a group of 7. How many possible groups of teams can there be

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?

What is the 9th term in the geometric sequence described by this explicit formula? an=-6. (2)(n-1) apex

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?