Which expression is equivalent to 2(a+3) when a= 3?
A 2(3)
B 5(3)
C 2(3)+3
D 2(3)+6

D

Step-by-step explanation:

2(a+3), a=3

2(3+3)

2(6)

12

A) 2(3)=5             (not equivalent)

B) 5(3)=15              (not equivalent)

C) 2(3)+3=9         (not equivalent)

D) 2(3)+6=12       (equivalent)

1.4

2.3

step-by-step explanation:

the formula for the constant of variation is

y= kx

divide each side by x

y/x =kx/x

y/x =k

we know a and y

1.   y/x = k

4/1 =4

check the other values to make sure they are the same

8/2 = 4   12/3 =4   and 16/4 =4  

the constant of variation is 4

2.   y/x = k

3/1 =3

check the other values to make sure they are the same

6/2 = 3   9/3 =3   and 12/4 =3  

the constant of variation is 3

7

step-by-step explanation: