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miv72 [106K]
3 years ago
10

The first side of a triangle is 7cm less than twice the second side. The third side is 4cm longer than the first side. The perim

eter is 80cm. Find the length of each side of the triangle.
Mathematics
1 answer:
Vinil7 [7]3 years ago
3 0

Given:

First side(A): 2B - 7

Second side(B): B

Third side(C): B + 4

Plug in values:

A + B + C = 80

2B - 7 + B + B + 4 = 80

If you look at the coefficients only, you can rewrite the equation like this:

2B + B + B - 7 + 4 = 80

This means that 4B - 7 + 4 = 80

=4B - 3 = 80

= 4B = 80 + 3

B = 83/4, so you can either write B as 83/4 or as 20.75.

Checking your work:

A: 2(20.75) - 7 = 34.5

B: 20.75

C: 4 + 20.75 = 24.75

34.5 + 20.75 + 24.75 = 80cm.

Hope this helped.

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grigory [225]

Answer:

<h2>2 (the answer should have a positive sign.)</h2><h2>The equivalent to -5-(-7) is -5+7.</h2>

Step-by-step explanation:

To solve this problem, use the order of operations.

PEMDAS

Parentheses

Exponents

Multiply

Divide

Add

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\sf{-5-(-7)=-5+7}

\sf{-5+7}

Add or subtract.

Solve.

-5+7=2

\large\boxed{2}

So, the correct answer is 2.

3 0
2 years ago
Find the measure of the angle, round to the nearest tenth: Sin X = .7547
dimulka [17.4K]
SIN(x) = .7547
X = INVERSE-SIN(.7547)
X = 49.0 degrees
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3 years ago
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Eva8 [605]
I think the answer is C.

First start by factoring, you should get (2n-3)(n-2)=0

Then start to solve for n.

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I hope that helps.
7 0
3 years ago
These box plots show daily low temperatures for a sample of days in two
Mumz [18]

Answer:

C. The distribution for town A is symmetric, but the distribution for

town B is negatively skewed.

Step-by-step Explanation:

From the box plots attached in the diagram below, which shows data of low temperatures for town A and town B for some days, we can compare the shapes of the box plot by visually analysing both box plots and how the data for each town is distributed.

=> For town A, the shape of the box plot is symmetric because both quartiles seem equal, and the median also divides the rectangular box into two equal halves. Both whiskers also appear to be of equal lengths.

The box plot for Town A takes a symmetric shape, and this shows a typical normal distribution of data.

=> On the other hand, Town B data distribution is different. The median seem close to the top half of the box and does not divide the box into equal halves. This shows the distribution is skewed. Since the whisker is shorter from the upper end of the box to the left side, we can infer that the distribution for Town B is skewed to the left, and it is negatively skewed.

=> The right comparison of the shapes of the box plots is "C. The distribution for town A is symmetric, but the distribution for town B is negatively skewed."

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2 years ago
What is 2 and negative three using integers​
Darina [25.2K]

If you mean "how to write the sum", the answer is

2+(-3)

The result of this sum is -1, because you start from 2 on the number line and take 3 steps to the left (negative integers mean going left, positive integers mean going right)

4 0
3 years ago
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