Write the sum using sigma notation: 3+6+9+12+⋯+120=∑an=1b.

Your sum is

Each term is a multiple of 3. The first term is 3·1 and the last term is 3·40. Thus for n=1 to 40, the general term is 3n.

given : the shape of his satellite can be modeled by   where x and y are modeled in inches.

now,the given equation   is a equation of parabola.

here, coefficient of x is positive, hence the parabola opens rightwards.

on comparing this equation with standard equation , we get

in standard equation, coordinates of focus=(0,m)

thus for given equation coordinates of focus=(0,1.5)

step-by-step explanation:

1260=3*6*7*10=3^2*2^2*7*5 perfect cude = 3^3*2^

step-by-step explanation: