Topic regarding vector
how to answer question a, b and c

Suppose the radius of a circle is 16. what issuppose the radius of a circle is 16. what is its circumference its circumference

The following division is being performed using multiplication by the reciprocal find the missing numbers is 5/12 divided by x/3 equals 5/12 times x/10 equals 1/x

The sum of the first eight terms of an arithmetic progression is 9m + 14. the fifth term of the06 progression is 2m - 6, where m is a constant.given that the first term of the progression is 26,find the value of the common difference, d and thevalue of m.