1.
-2x = 10
x = 10/(-2)
x = -5
2.
1/2 x = 5
x = 5 * 2
x = 10
3.
5x = -20
x = -20/5
x = -4
4.
9x = 36
x = 36/9
x = 4
3(b+f) you just do the sum and times it by 3
6.

since

feet. Then 6*4=24 So the answer is C
7. 1200 m/8 cm = C. 1 cm = 150 m
8. A. Since 1 in = 3 feet then 6 inches = 18 feet (6*3=18) and 4 inches = 12 feet (4*3=12) so the dimensions of her room are 16'x12'.
B. A=lxw so 16*12= 216

Hope that helps
Answer:
h. 36
Step-by-step explanation:
For a 68.26% confidence, z = 1.0.
Standard deviation (s) = 30 minutes
The sample size needed to assure that the sample mean does not differ from the true mean by more than 5 minutes is given by:
The sample size needed is 36.