the first term of an AP is a and the common different is -1.if the sum of the first n term is equal to the sum of the first 3n terms of the progression. express a in terms of n, obtain the value of a when n is 10 and hence find the sum of the first 30 term of the progression​

v = 1/3 a^2h

step-by-step explanation:

the volume is 1/3 a^2h.

for this pair of functions g(x)=x-2 and f(x)=|x| is (g o f)(a)= |a| -2

step-by-step explanation:

g(x)=x-2

f(x)=|x|

(g o f)(a)=?

(g o f)(x)=g(f(x))

(g o f)(x)=g(|x|)

(g o f)(x)=|x|-2

(g o f)(a)=|a|-2

students group

step-by-step explanation:

a person who   joins a party or a seminar can explain his feelings about that particular occasion better more than anyone else.

as bella managed a show for the students in the school and invited students to watch that show

hence

students group will be the best group to survey to find this information