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3 years ago

I got an answer but im really not sure if its right so please help

Mathematics

2 answers:

Vladimir79 [104]3 years ago

5 0

Answer:

60 degrees.

Step-by-step explanation:

Since you know that y = 74 because they are vertical angles, and 46 = the angle across from it (there is a theorem for it). Since one line is 180 degrees, and you already know the two sides next to x, which is 74 and 46, you can do 180 - 74 - 46. Your final answer should be 60 degrees.

igor_vitrenko [27]3 years ago

3 0

Answer:

60°

Step-by-step explanation:

so we need to find x

we are given 2 angles 46° and 74° which is in the middle of those numbers.

add 46° + 74° = 120°

since a straight line is 180° subtract 180° by 120° to get 60° = x.

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Simplify: (2x-3)(4x+1)

mixas84 [53]

Answer:

$8x^2-10x-3$

Step-by-step explanation:

$(2x-3)(4x+1)$

$2x(4x+1)-3(4x+1)$

$8x^2+2x-12x-3$

$8x^2-10x-3$

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3 years ago

Mark practices his guitar 3/4 hours each day. How many hours does he practice in seven days?

Mashutka [201]

3/4 *7
or
0.75*7
The answer is 5.25

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4 years ago

Maisie has saved up $50 to buy concert tickets, but the tickets cost $125. She is able to earn $15 per day by walking her neighb

dusya [7]

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8 0

3 years ago

Read 2 more answers

A particular battery claims to have a mean life of 400 hours with a standard deviation of 30 hours. Approximately what percent o

Svetach [21]

Using the normal distribution, it is found that 25.14% of the batteries will last more than 420 hours.

<h3>Normal Probability Distribution</h3>

The z-score of a measure X of a normally distributed variable with mean $\mu$ and standard deviation $\sigma$ is given by:

$Z = \frac{X - \mu}{\sigma}$

The z-score measures how many standard deviations the measure is above or below the mean.

Looking at the z-score table, the p-value associated with this z-score is found, which is the percentile of X.

In this problem, we have that the mean and the standard deviation are given, respectively, by:

$\mu = 400, \sigma = 30$ .

The proportion of the batteries will last more than 420 hours is <u>one subtracted by the p-value of Z when X = 420</u>, hence:

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{420 - 400}{30}$

Z = 0.67

Z = 0.67 has a p-value of 0.7486.

1 - 0.7486 = 0.2514.

0.2514 = 25.14% of the batteries will last more than 420 hours.

More can be learned about the normal distribution at brainly.com/question/24663213

#SPJ1

3 0

2 years ago

Prove that triangle with side lengths of x^2-1, 2x, x^2+1 is a right triangle.

Brrunno [24]

Right triangles must follow the pythagorean theorem, so a^2+b^2=c^2.

Let's find a^2 and b^2 by squaring the first 2 side lengths.

(x^2-1)^2= x^4-2x^2+1
(2x)^2= 4x^2

Then add the two to find c^2
x^4+ 2x^2 +1= c^2

Root both sides
x^2+1=c

Since the side lengths can be plugged into the pythagorean theorem, the side lengths must represent a right triangle.
Hope this helps!

7 0

3 years ago