Answer:
c
Step-by-step explanation:
25% = 15$ so 15+15+15+15=60
Answer:
3x^2 -2x-8
Step-by-step explanation:
(x-2)(3x+4)
FOIL
first: 3x*x = 3x^2
outer: x*4 =4x
inner: -2*3x = -6x
last: -2*4 = -8
Add together: 3x^2 +4x-6x -8
3x^2 -2x-8
Answer:
0.7477
Step-by-step explanation:
The mean(X) = 25,000 hrs
Standard deviation (σ) = 1500 hrs
The probability that the light bulb lasts more than 24,000hrs is Pr (X˃24,000)
Using Z-scores, Z= (X- μ)/σ
For X = 24,000
Z = (24,000 – 25,000)/1500
Z = -1000/1500
Z = -0.667
From the normal distribution table, Z= 0.667 = 0.2477
Φ(Z) = 0.2477
Recall that if Z is negative,
Pr (X˃a) = 0.5 + Φ(Z)
Pr (X˃24,000) = 0.5 + 0.2477
= 0.7477
Answer:
-14
Step-by-step explanation:
a·b = |a|×|b|×cos(angle between them)
= 4×7×(-1/2)
= -14