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Sveta_85 [38]
3 years ago
9

Leala took five tests in science. Find her average score to the nearest tenth:

Mathematics
2 answers:
oee [108]3 years ago
8 0
80, 90, 90, 100, 80 is the average to the neasrest tenth
anygoal [31]3 years ago
8 0
To find this out, add them all up and divide by the number of items you added up: 

78 + 92 + 94 + 97.5 + 83 = 444.5

444.5 / 5 = 88.9

So Leala's average for her sciences tests is an 88.9

Hope this helps!
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What does a supplementary angle look like
Keith_Richards [23]

Answer:

It has no special appearance.

Step-by-step explanation:

Any angle of measure 180° or less is supplementary to some angle. A supplementary angle is one that is the difference between 180° and the angle you have. That is, two supplementary angles total 180°.

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Supplementary angles are readily identifiable in a number of geometries. Adjacent angles of a parallelogram are supplementary; linear angles are supplementary. Same-side interior angles where a transversal crosses parallel lines are supplementary.

8 0
3 years ago
Triangle ABC has coordinates of A(–8, –8), B(4, –2), and C(2, 2). Find the coordinates of its image after a dilation centered at
kherson [118]
The answer is (C) because you multiply each point by 1.5.
7 0
3 years ago
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Are the two expressions equivalent when x = 5? 24x + 18 and 6 (4x + 2)
patriot [66]

Answer:

Nope-

Step-by-step explanation:

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6 (4x + 2) = 132

3 0
3 years ago
A survey was conducted that asked 1003 1003 people how many books they had read in the past year. results indicated that x overb
kirill115 [55]
The confidence interval is

10.5\pm1.35 = (9.15, 11.85).  This means that we can be 99% confident that the mean number of books people read lies between 9.15 and 11.85.

To find the confidence interval, we first find the z-score associated with it:

Convert 99% to a decimal:  0.99
Subtract from 1:  1-0.99=0.01
Divide by 2:  0.01/2 = 0.005
Subtract from 1:  1-0.005 = 0.995

Using a z-table (http://www.z-table.com) we see that this is associated with a z-score between 2.57 and 2.58.  Since both are equally far from this value we will use 2.575.

We calculate the margin of error using

ME=z*\frac{s}{\sqrt{n}}
\\
\\=2.575*\frac{16.6}{\sqrt{1003}}=1.35

This means that the confidence interval is
10.5\pm1.35

The lower limit is given by 10.5-1.35 = 9.15.
The upper limit is given by 10.5+1.35 = 11.85
5 0
3 years ago
One safe investment pays 10% per year, and a more risky investment pays 13% per year.
Maru [420]

Answer:

0.10x + 0.13y = 10780

x + y = 100000

x = 74000 --------------10%

y = 26000 --------------13% (more risky)

8 0
1 year ago
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