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mel-nik [20]
3 years ago
5

In the following equilateral triangle, each angle has a measure of 10x + 20. X=[? ]

Mathematics
2 answers:
maria [59]3 years ago
8 0

Answer:

4°

Step-by-step explanation:

All the angles in a triangle add together to equal 180°. We know there are three angles of 20° so let's subtract this.

20° × 3 = 60°

180° - 60° = 120°

Now well divide 120° up among the three angles.

120° ÷ 3 = 40°

Now we know the angles are 40° + 20°, but we need to find the value of x, so divide 40° by 10

40° ÷ 10 = 4°

x = 4°

Dafna1 [17]3 years ago
5 0

Answer:4

Step-by-step explanation: Since you know this triangle is an equilateral, you know all angles are the same, so you should automatically multiply 10x+20 by 3. You would then get 30x+60. Since all triangle's total angle sum is 180, you know to set 30x+60 to 180.

At this point this might seem new, but this is where you isolate x. First you move the 60, but subtracting it from both sides. This gets you 30x=120.  You divide 30 on both sides and you finally get your answer: 4.

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3 years ago
Becky spent 3/4 of an hour practicing the piano.She spent 1/2 of that time practicing her recital piece. What fractional part of
Ber [7]

Answer:

3/8

Step-by-step explanation:

First,

convert  3/4 of an hour to minutes;

If 1 hr = 60 mins

then 3/4 of 1hr = \frac{3}{4} *60\\ \\ =45 mins.Next, If 1/2 of 3/4 was spent practicing recital piece, it means that it is half of 45 mins;1/2 *45 = 22.5 minsLastly, convert the 22.5 mins into a fraction of an hour;22.5/60 = [tex]\frac{3}{8}

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3 years ago
If a • b > 0 and a < 0, what must be true about b?
Musya8 [376]

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Step-by-step explanation:

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3 years ago
Maria has a box of 20 cookies. She gives 2 cookies to each friend. Which expression shows the number of cookies Maria has left a
eimsori [14]
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8 0
3 years ago
Read 2 more answers
A random sample of 10 subjects have weights with a standard deviation of 13.5620 kg. What is the variance of their​ weights? Be
Iteru [2.4K]

Answer:

183.927844 kg²

Step-by-step explanation:

Calculation for the weight variance:

Given that s =13.5620 kg

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S²=183.927844

The units of the variance will be the units of the Standard Deviation Squared which is Kg²

Therefore the variance of their weight will be:

183.927844 kg²

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