PreCalc help with sums. I will mark brainliest. (also can you explain WHY you got what answer you got? Thanks)

5.25

Step-by-step explanation:

a = 4.2

r = 1/5 = 0.2

Sum to infinity:

a/(1 - r)

4.2/(1 - 0.2)

4.2/0.8

21/4

5.25

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: