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brilliants [131]
3 years ago
13

Cos(x+pi) = 1/2 over the interval [pi/2, pi]

Mathematics
2 answers:
Neporo4naja [7]3 years ago
8 0

Answer: B

Step-by-step explanation:

valkas [14]3 years ago
3 0

Answer:B

Step-by-step explanation:

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. Which equation represents y = −x2 + 4x − 1 in vertex form?
Stels [109]

Answer:

Rewrite in vertex form and use this form to find the vertex  

(

h

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Step-by-step explanation:

6 0
3 years ago
Suppose a brand of light bulbs is normally​ distributed, with a mean life of 1300 hr and a standard deviation of 50 hr. Find the
tatyana61 [14]

Answer:

Step-by-step explanation:

Since the life of the brand of light bulbs is normally​ distributed, we would apply the the formula for normal distribution which is expressed as

z = (x - u)/s

Where

x = life of the brand of lightbulbs

u = mean life

s = standard deviation

From the information given,

u = 1300 hrs

s = 50 hrs

We want to find the probability that a light bulb of that brand lasts between 1225 hr and 1365 hr. It is expressed as

P(1225 ≤ x ≤ 1365)

For x = 1225,

z = (1225 - 1300)/50 = - 1.5

Looking at the normal distribution table, the probability corresponding to the z score is

0.06681

For x = 1365,

z = (1365 - 1300)/50 = 1.3

Looking at the normal distribution table, the probability corresponding to the z score is

0.9032

Therefore

P(1225 ≤ x ≤ 1365) = 0.9032 - 0.06681 = 0.8364

7 0
3 years ago
ABC is a straight line and angle CBD is 116
shusha [124]

I think this is what your talking about

8 0
3 years ago
What is the area of the parallelogram?<br> cm2<br> 7 cm<br> 1.2 cm
9966 [12]
What are numbers used though? I can’t answer if you don’t say the full problem because there aren’t any units or numbers.
7 0
3 years ago
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