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2 years ago

What is the exact value of cos(-60°)?

Mathematics

2 answers:

vladimir1956 [14]2 years ago

8 0

Cos (-60) = 1/2

If you look at the cosine graph below you can see the black line pointing at 60 degrees is at 0.5, which is 1/2

Afina-wow [57]2 years ago

4 0

Answer: 1/2

Step-by-step explanation:

cosine=adjacent/hypotenuse

Cos (-60)=1/2

This is a special triangle

see below as the ratio of each side

Hope this helps!! :)

Please let me know if you have any question

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Ivan

72 divided by 6374 is equal to 0.0113

Hope it helps :)

6 0

3 years ago

Help! in 20P9 what does the 9 represent?

Alex777 [14]

Answer:

Step-by-step explanation:

Good question. It is important to know the answer.

The 9 means that there are a total of 20 objects. You want to select just 9 of them.

The situation is well described by C.

6 0

3 years ago

Suppose a and b are independent events if p(a/b)=.25 and p(b)=.6 what is P(AnB)?

Talja [164]

Answer:

0.15

Step-by-step explanation:

Independent Probabilities Formula

P(A | B) = P(A) = P(A ∩ B) ÷ P(B)

P(A | B) = 0.25

P(A) = 0.25

P(B) = 0.6

If P(A) = P(A ∩ B) ÷ P(B)

P(A ∩ B) = P(A) × P(B)

P(A ∩ B) = 0.25 × 0.6

P(A ∩ B) = 0.15

4 0

2 years ago

Simplify x^2+ 5x + 4 over x+4

harkovskaia [24]

Answer:

x+1

Step-by-step explanation:

6 0

3 years ago

Please can I have an explanation also, I am terrible at these kinds of questions!

wlad13 [49]

Answer:

The fraction of the beads that are red is

Step-by-step explanation:

Algebraic Expressions

A bag contains red (r), yellow (y), and blue (b) beads. We are given the following ratios:

r:y = 2:3

y:b = 5:4

We are required to find r:s, where s is the total of beads in the bag, or

s = r + y + b

Thus, we need to calculate:

$\displaystyle \frac{r}{r+y+b} \qquad\qquad [1]$

Knowing that:

$\displaystyle \frac{r}{y}=\frac{2}{3} \qquad\qquad [2]$

$\displaystyle \frac{y}{b}=\frac{5}{4}$

Multiplying the equations above:

$\displaystyle \frac{r}{y}\frac{y}{b}=\frac{2}{3}\frac{5}{4}$

Simplifying:

$\displaystyle \frac{r}{b}=\frac{5}{6} \qquad\qquad [3]$

Dividing [1] by r:

$\displaystyle \frac{r}{r+y+b}=\displaystyle \frac{1}{1+y/r+b/r}$

Substituting from [2] and [3]:

$\displaystyle \frac{r}{r+y+b}=\displaystyle \frac{1}{1+3/2+6/5}$

Operating:

$\displaystyle \frac{r}{r+y+b}=\displaystyle \frac{1}{\frac{10+3*5+6*2}{10}}$

$\displaystyle \frac{r}{r+y+b}=\displaystyle \frac{10}{10+15+12}$

$\displaystyle \frac{r}{r+y+b}=\displaystyle \frac{10}{37}$

The fraction of the beads that are red is $\mathbf{\frac{10}{37}}$

8 0

2 years ago

What is the exact value of cos(-60°)?​

What is the exact value of cos(-60°)?