Answer:
Read the explanation!
Step-by-step explanation:
<em>Let the "certain number" be </em>
<em>. </em>
(
is a symbol for multiplication).
<em>Create a few equations and expressions:</em>
The sum of 12 and a certain number: 
The product of 3 and the number: 
The sum of 12 and a certain number is equal to the product of 3 and the number:
= 
Solve!
12=3x-x
12=2x
x=6
108 you don't need the distributive property.
Step-by-step explanation:
(x+2y)(x-2y)
- x^2-2xy+2xy-(2y)^2
- x^2-4y^2
Answer:
No.The answer should be -4.1
Step-by-step explanation:
1+4(3x-10)-12
5(3x-10)-12
15x-50-12
15x-62
x=-62/15
x=-4.1
R^2=(x-6)^2+(y-4)^2
r^2=(6-2)^2+(4-1)^2, r^2=16+9=25
(x-6)^2+(y-4)^2=25