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lesya692 [45]
3 years ago
15

Evaluate: 2·5/4-2 A) 5/8 B) 8/5 C) 40 D) 160

Mathematics
1 answer:
allochka39001 [22]3 years ago
6 0

Answer: 1/2

<u>Multiply</u>

2×5=10

10/4-2 is your new problem

<u>Simplify</u>

10/4 = 5/2

5/2-2 is your new problem

<u>Subtract</u>

5/2-2=1/2

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Pls help me on this k12 question.
andrew-mc [135]

Answer: The answer is A, 132 units

Step-by-step explanation:

8 0
3 years ago
slader Suppose that 8% of all bicycle racers use steroids, that a bicyclist who uses steroids tests positive for steroids 96% of
d1i1m1o1n [39]

Answer:

P = 0.4812

Step-by-step explanation:

First, we need to use here two expressions and then do the calculations.

The first one is the conditional probability which is:

P(B|A) = P(A∩B)/P(A)   (1)

The second expression to use has relation with the Bayes's theorem which is the following:

P(D|C) = P(C|D)*P(D) / P(C|D)*P(D) + P(C|d)*P(d)   (2)

Now, the expression (2) is the one that we will use to calculate the probability of a selected random bicyclist who tests positive for steroids.

So, in this case, we will call C for positive and D that is using steroids and d is the opposite of d, which means do not use steroids.

Then, the probabilities are the following:

P(D) = 8% or 0.08

P(C|D) = 96% or 0.96

P(C|d) = 9% or 0.09

P(d) = 1 - 0.08 = 0.92

With these data, let's replace in expression 2

P(D|C) = 0.96 * 0.08 /0.96 * 0.08 + 0.09*0.92

P(D|C) = 0.0768 / 0.1596

P(D|C) = 0.4812 or 48.12%

8 0
3 years ago
What is the classification of a right angle?
Helen [10]
A right angle is an angle with a measure of 90 degrees.
8 0
3 years ago
Read 2 more answers
78. How can the polynomial, 18x^2 + 30x^6 be factored using the GCF?
dexar [7]

Answer:

6x^2(5x^4 +3)

Step-by-step explanation:

The greatest common factor of 18 = 3·6 and 30 = 5·6 is 6.

The greatest common factor of x^2 and x^6 is x^2.

Factoring 6x^2 from both terms, we get ...

... 18x^2 +30x^6 = 6x^2(3 +5x^4)

_____

<em>Comment on the question</em>

Since this answer is not among the answer choices, I suggest you ask your teacher to demonstrate how this problem is worked.

It appears as though the answers go with the problem 18x^9 +30x^6. Maybe there's a typo somewhere. For that problem, the best choice is the 2nd answer.

6 0
3 years ago
Find an expression which represents the difference when (2 + 4y) is subtracted
nikklg [1K]

Answer:

Simplifying 6x * 3y * 9x2y4 Reorder the terms for easier multiplication: 6 * 3 * 9x * y * x2y4 ... When you enter an expression into the calculator, the calculator will simplify the ... For addition and subtraction, use the standard + and - symbols respectively.

Step-by-step explanation:

7 0
3 years ago
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