Answer:
8x+12
Step-by-step explanation:
We know that squares have equal sides. To calculate perimeter, just add up all of the 4 sides.
2x+3+2x+3+2x=3+2x+3
Add like terms:
8x+12
You could also multiply by four:
4(2x+3)
Use distributive property:
8x+12
Answer:
77
Step-by-step explanation:
10%=11
because you divide 110 by 10.
Then i would multiply that by 3, giving you 33
110-33=77
Answer:
The sample size required is 2500.
Step-by-step explanation:
z-score:
In function of the margin of error M, the z-score is given by:
In this question, we have that:
So
The sample size required is 2500.
You'll have to multiply 0.7 by 120.
120*0.7 = n
n is the number that is 70% of 120
120 * 0.7 = 84
Hope this helps :)
I believe the answer is the first option. Tell me if i'm wrong. :)
