Answer:
-240
Step-by-step explanation:
500 - 800 + 60
= -300 + 60 = -240
Equation :
[x(x+4)]/2=6 (as (b*h)/2=A)
x*x + 4*x -12 = 0
so, x = 2 units(as -6 is negative)
Answer:
30°
Step-by-step explanation:
180-75-75=30
Answer:
x=62
Step-by-step explanation:
1. add + 25 to both sides because when you have a negative you have to add.
2. When you add 25 to 37 you get 62.
therefore 62 is the answer
Answer:
21.759
Step-by-step explanation:
Given that :
Mean (m) = 25
Standard deviation (s) = 12.5
Sample size (n) = 40
α = 90%
The confidence interval is obtained using the relation:
Mean ± Zcritical * s/sqrt(n)
Zcritical at 90% confidence interval = 1.64
25 ± 1.64 * (12.5/sqrt(40))
Lower boundary : 25 - 1.64(1.9764235) = 21.75866546
Upper boundary : 25 + 1.64(1.9764235) = 28.24133454
(21.759, 28.241)
Hence, lower bound of confidence interval is : 21.759
