Which of the equations listed below are linear equations?

1: c= 2pir
2: a= pir^2
3: v= 4/3pir^3

a equation 1 only
b equation 2 only
c equations 1 and 3

1.

Step-by-step explanation:

We know that a linear equation is a particular type of equation .

The given equations :

Here , variable = r (radius)

Since , the variable has exponent =1 , therefore it is a linear equation.

Here , variable = r (radius)

Since , the variable has exponent =2 , therefore it is not a linear equation.

Here , variable = r (radius)

Since , the variable has exponent =3 , therefore it is not a linear equation.

Hence , the correct answer is .

687.09 dollars       happy now

step-by-step explanation: 6870

1857 times .63 equals 1169.91 subtract that from 1857 you get 687.09

the discriminant is 64 + 4*1*12 = 112

this is prime.

step-by-step explanation: