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2 years ago

Eight angles of a nonagon measure 1389, 154º. 145°, 132°, 148°, 143,

Mathematics

1 answer:

PIT_PIT [208]2 years ago

6 0

Answer:

103°

Step-by-step explanation:

The total angle in a nonagon is 1260. To get the missing angle, we add up all the given angle together and subtract it from 1260.

138 + 154º + 145° + 132° + 148° + 143 + 147 + 150 = 1157

1260 - 1157 = 103

Therefore, the missing angle is 103°

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Hello, 30 POINTS + BRAINLIEST If correct and has a long explanation. I looked at the same thing in other places but I think thos

ludmilkaskok [199]

Answer:

Step-by-step explanation:

We have a table listing the number of minutes Trayvon practiced the Backstroke and Butterfly on Monday, Wednesday, and Friday.

We want to find event that Trayvon spent more time practicing.

To do so, we add up all the minutes of one event and compare this to the total minutes of the other event.

Therefore, we can eliminate options C and D. These two options evaluate the time on Wednesday compared to other days, but we want to do is to find which event did Trayvon spend the longest on.

So, let's add up all the minutes spent doing the Backstroke. Trayvon over the course of the three days spent 12.5 mins, 15.67 mins, and 9.32 mins.

Therefore, the total minutes Trayvon spend practicing the Backstroke is:

$12.5+15.67+9.32=37.49\text{ mins}$

Now, let's add up all the minutes spent doing the Butterfly. Trayvon spent 14.333 mins, 12.1 mins, and 10.78 mins over the course of three days. So, the total time spent doing the Butterfly is:

$14.333+12.1+10.78=37.213\text{ mins}$

Trayvon spent a total of 37.49 minutes doing the Backstroke and 37.213 minutes doing the Butterfly.

37.49 is greater than 37.213. So, Trayvon spent more time practicing the Backstroke.

So, our correct answer is A.

There are some number and calculation errors in B.

And we're done!

5 0

3 years ago

Read 2 more answers

HELP!!!

scoundrel [369]

Answer:

The metalworker should use 60 kg of metal alloy that is 70% copper and 40 kg of metal alloy that is 20% copper.

Step-by-step explanation:

System of Equations

Let's call

x=amount of metal alloy that is 20% copper

y=amount of metal alloy that is 70% copper

The metalworker wants to create 100 Kg of 50% copper alloy. This gives us the first relation

x+y=100

The combination of 20% of x and 70% of y will produce 50% of the sum of both, thus

20x+70y=50(x+y)

Operating

20x+70y=50x+50y

Reducing and dividing by 10

2y=3x

The system of equations is easily solved by isolating x in the first equation

x=100-y

And replacing into the last equation

2y=3(100-y)

Operating

2y=300-3y

5y=300

y=60

Thus

x=100-60=40

The metalworker should use 60 kg of metal alloy that is 70% copper and 40 kg of metal alloy that is 20% copper.

3 0

2 years ago

It is not B so plz help me

11111nata11111 [884]

Answer:

The picture is blocked out D:

Step-by-step explanation:

6 0

2 years ago

Read 2 more answers

Which expression is equivalent to the following complex fraction?

tatyana61 [14]

$\dfrac{\frac{x}{x-3}}{\frac{x^2}{x^2-9}}=\dfrac{x(x^2-9)}{(x-3)x^2}=\dfrac{x(x+3)(x-3)}{(x-3)x\cdot x}=\dfrac{x+3}{x}$

Answer C.

3 0

3 years ago

You are going to roll two dice. Let the variable x = the sum of the numbers rolled. What is the probability that x = 9 ?

Vladimir79 [104]

The first cube can land in any one of 6 ways.
The second cube can land in any one of 6 ways.
Total number of ways that 2 dice can land = (6 x 6) = 36 ways.

For any of these ways, the sum of the numbers rolled is 9 :

3, 6
4, 5
5, 4
6, 3

There are 4 ways to roll a 9, out of a total of 36 ways that
the dice can land. So the probability of rolling a 9 is

4 / 36 = 1 / 9 = 11-1/9 percent

7 0

2 years ago