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Korolek [52]
3 years ago
13

I need to find the identity of this equation for pre calc ​

Mathematics
1 answer:
Rama09 [41]3 years ago
6 0

Expand the left side using the angle sum identity for sine:

sin(<em>x</em> + <em>π</em>/2) = sin(<em>x</em>) cos(<em>π</em>/2) + cos(<em>x</em>) sin(<em>π</em>/2)

cos(<em>π</em>/2) = 0 and sin(<em>π</em>/2) = 1, so the right side reduces to

sin(<em>x</em> + <em>π</em>/2) = cos(<em>x</em>)

as required.

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4.20. According to a report released by the National Center for Health Statistics, 51% of U.S. households has only cell phones (
Sergeu [11.5K]

Answer:

The probability that the household has only cell phones and has high-speed Internet is 0.408

Step-by-step explanation:

Let A be the event that represents U.S. households has only cell phones

Let B be the event that represents U.S. households have high-speed Internet.

We are given that 51% of U.S. households has only cell phones

P(A)=0.51

We are given that 70% of the U.S. households have high-speed Internet.

P(B)=0.7

We are given that U.S. households having only cell phones, 80% have high-speed Internet. A U.S household is randomly selected.

P(B|A)=0.8

\frac{P(A\capB)}{P(A)}=0.8\\P(A\capB)=0.8 \times P(A)\\P(A\capB)=0.8 \times 0.51\\P(A\capB)=0.408

Hence the probability that the household has only cell phones and has high-speed Internet is 0.408

7 0
2 years ago
Ok need help please help Thank you
Step2247 [10]
96 1/2 

there is ur answer i think :)
7 0
3 years ago
If 75% is £60 what is the full cost
fgiga [73]
If you would like to know what is the full cost if 75% is £60, you can calculate this using the following steps:

75% of x = £60
75% * x = £60
75/100 * x = 60     /*100/75
x = 60 * 100 / 75
x = £80

Result: The full cost is £80.

4 0
3 years ago
Three even numbers sum up to 252. the smallest is half the largest and the middle number is 3/4 the largest. what are the three
Mnenie [13.5K]
Let the largest number be x:
smallest number=1/2x
middle number=3/4x
total sum of the numbers is:
x+1/2x+3/4x=252
9/4x=252
solving for x we get
x=252×4/9
x=112
thus the largest number is 112
middle number=3/4*112=84
smallest number=1/2×112=56
Answer: 56,84,112
3 0
3 years ago
Which describes the correct way to convert minutes to hours? ​
Lesechka [4]

Answer:

Step-by-step explanation:

take the number if its 130 minutes keep subtravting by 60 then keep a tally till you cant subtract no more. Then in this case it would be  2 hours and ten minutes

6 0
2 years ago
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