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Fantom [35]
4 years ago
7

Which of the following expressions is equal to -1? Help plzzz

Mathematics
2 answers:
Anna007 [38]4 years ago
6 0

Answer:

Sec 90

Step-by-step explanation:

Sec 90 is equals to -1

Elena-2011 [213]4 years ago
6 0

Answer:

csc 270°

Step-by-step explanation:

sec 90° = 1/cos 90° = 1/0 which is undefined

sin 180° = 0

csc 270° = 1/sin 270° = 1/-1 = -1

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Which algebraic expression represents “the class was divided into 6 equal groups”?
pishuonlain [190]

The algebraic expression n/6 represents that the class was divided into 6 equal groups.

3 0
4 years ago
Which answer is the approximate standard deviation of the data set?
Ierofanga [76]

Answer:  A. 6.5

Step-by-step explanation:

Here, the given set = { 15, 19 3, 12, 17, 2, 2, 8}

Mean, \overline{ x} = \frac{15+19+3+12+17+2+2+8}{8} = \frac{78}{8} = 9.75

Number of elements, n = 8

\frac{\sum (|x-\overline{x}|)^2}{n}=42.4375

Thus, the standard deviation, \sigma =\frac{\sqrt{\sum(|x-\overline{x}|)^2} }{n}=\sqrt{\frac{339.5}{8}}=\sqrt{42.4375} = 6.51440711\approx 6.5

⇒ Option A is correct.

4 0
3 years ago
Read 2 more answers
3 x (4 + 7) - * 4) + (7)
Zarrin [17]

Answer:

22 assuming the * was a mistake im not sure if u meant the * if u did mean in what does it mean

Step-by-step explanation:

4 0
3 years ago
A. A car is marked down by 20%. It normally sells for $20,000. What is the sale
Novay_Z [31]

Answer:

A=16000  B=16400

Step-by-step explanation:

1.  You multiply 20,000 by .2 or 20%, because you are trying to find a part of the 20,000.

2. You get 4,000 dollars, that is 20% of 20,000. To find the sale price, you take the 20% away from 20,000, which would be 16,000 dollars. That would be your answer for the first part.

3. the sales tax is 2.5% of the sale price. Again, you multiply 16,000 dollars, your sales price, by .025 or 2.5%.

4. you would get 400 dollars. You add the 2.5% or 400 dollars because you have to pay the tax as well as the price. You would get 16,400 dollars.

6 0
3 years ago
Evaluate f(-1) for the function f(x) = -5x + 3 *
tatuchka [14]

Answer:

f(-1) = 8

Step-by-step explanation:

f(-1) = x

f(-1) = -5(-1) + 3

f(-1) = 8

4 0
3 years ago
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