Which is a TRUE statement about the axis of symmetry of a parabola?
The axis of symmetry passes through the vertex of a parabola.
O The axis of symmetry is the y-intercept.
The axis of symmetry is a horizontal line.
The equation of the axis of symmetry contains the y-value of the vertex of a parabola.

e.

step-by-step explanation:

because there are always 10 numbers in a phone number.

b. x- 48 =120

step-by-step explanation:

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -