Astack of seven different cards are shuffled and spread out face down if three cards are turned face up how many different three card combinations are possible

Step-by-step explanation:

is the number of ways of choosing distinct objects from a lot of distinct objects.

In the given question,

So,

So,there are ways in which three distinct cards can be selecte from seven distinct cards.

i dont know

step-by-step explanation:

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: