Answer:

Step-by-step explanation:
Given the expression 
Using law of indices: 

Also:13+8=21
Therefore:

Answer:
22
Step-by-step explanation:
12+12=24
46-24=22
Answer:
Find the GCD (or HCF) of numerator and denominator. GCD of 6 and 1 is 1.
6 ÷ 11 ÷ 1.
Reduced fraction: 61. Therefore, 6/1 simplified to lowest terms is 6/1.
B
given f(x) in factored form, equate to zero for x-intercepts
(x - 8)(x - 4) = 0, hence
x = 4, x = 8 ← x- intercepts
The vertex lies on the axis of symmetry which is situated at the midpoint of the x- intercepts
x- coordinate of vertex =
= 6
f(6) = (6 - 8 )(6 - 4 ) = -2 × 2 = - 4 ← y-coordinate
vertex = (6, - 4 ) → B