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murzikaleks [220]
2 years ago
7

If the sin 90 degrees is 1, then the cos___degrees=___

Mathematics
2 answers:
Leona [35]2 years ago
8 0
If sin(90°) = 1, then cos(90°-90°) = cos(0°) = 1
Solnce55 [7]2 years ago
8 0
We'll use this identity: 
cos(90 - x) = sin(x)
where x is any real number

If x = 90, then sin(x) = sin(90) = 1 which is given to us. 

So this means

cos(90 - x) = sin(x)
cos(90 - 90) = sin(90)
cos(0) = 1

So it's likely your teacher is looking for you to write cos(0) = 1

However, the prompt and instructions are a bit vague. There are other possibilities that I may not be thinking of. 
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A local company wants to evaluate their quality of service by surveying their customers.
stich3 [128]

Answer: b. 0.98

Step-by-step explanation:

The formula to find the maximum error of the estimated mean :

E=z^*\dfrac{\sigma}{\sqrt{n}}            (1)

, where \sigma = standard deviation

n= Sample size

z* = Critical z-value.

As per given , we have

\sigma=5

n=100

Critical value for 95% confidence interval = z*=1.96

Put these values in the formula (1), we get

E=(1.96)\dfrac{5}{\sqrt{100}}

E=(1.96)\dfrac{5}{10}=0.98

Hence, the maximum error of the estimated mean quality for a 95% level of confidence is 0.98.

Therefore , the correct answer is b. 0.98 .

6 0
2 years ago
Read 2 more answers
You and three friends are going to the fair. The cost for
lions [1.4K]

Answer:

$17 on food per person

Step-by-step explanation:

The cost of parking a car is $5

Assuming that the friends used one car, then the parking cost=$5

Admission cost is 19

For three people, Admission cost =19*3=57

TOTAl COSTS=Parking cost+Admission cost

TOTAl COSTS=57+5=62

Remaining amount can be used for food

FOOD= 113-62=51

Therefore each person can spend 51/3=$17 on food

I hope this was helpful and clear to follow

3 0
2 years ago
Read 2 more answers
3/4 of a right angle, 5/4 of a right angle, 5/3 of a right angle, and 2/3 of a full turn
aniked [119]
1.3/4 of right angle is 3/4*90=67.5
2.5/4 of right angle is 5/4*90=112.5
3.5/3 of right angle is 5/3*90=150
4.2/3 of right angle is 2/3*90=60
4 0
3 years ago
Scientists discovered that a new spider can grow 5 legs every year, on top of the 4 legs it already starts with. Scientists used
Karo-lina-s [1.5K]

Answer:

i think it is S

Step-by-step explanation:

i took the test on k12

5 0
3 years ago
Write the equation of a line that is perpendicular to y=-2/7x + 9 and that passes through the point (-4,6) [FP]​
siniylev [52]

Answer:

$y=(7/2)x+20$

Step-by-step explanation:

SInce the gradient of the first line is $-2/7$ then the gradien of the perpendicular line is $7/2$.

Therefore by the point slope formula the line that we are looking for is

$y-6=(7/2)(x+4)$

$y=(7/2)x + 20$

7 0
3 years ago
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