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4 years ago

Can some figure this out

Mathematics

1 answer:

NeX [460]4 years ago

8 0

Hello,

As 4²+(5/2)²=22.25=89/4 (Pytagorean theorem)
Perimeter of the triangle =2*√89 /2 +5 =5+√89
Lateral area: 18*(5+√89)
Total area= 90+18√89+ 4*5/2 *2 =110+18√89 ≈279.811..(ft²)

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The mean of a list of test scores is 80. Adding an additional test score of 92 caused the mean to rise to 82. After this additio

miv72 [106K]

Answer:

Step-by-step explanation:

The mean of a list of test scores is 80

Adding an additional test score of 92 caused the mean to rise to 82

To find:

After this additional, how many total test are in the list ?

Solution:

Let the total number of test at first = $n$

And sum of total score = $S$

As we know, mean = $\frac{sum \ of \ total \ observation}{number\ of \ total\ observation}$

$80= \frac{S}{n} \\$

Multiplying both sides by $n$

$80n=S$

Now, as adding an additional test score of 92 caused the mean to rise to 82,

$S+92=82\times(n+1)\\80n +92 = 82n+82 \ (given \ S =80n)$

$80n-82n =82-92\\-2n=-10$

By dividing both sides by minus ( - )

$2n =10$

By dividing both sides by 2

$n =5$

Thus, total number of test at first = $n$ = 5

And, after this additional score added, total number of tests are $n+1=6$

4 0

3 years ago

Help me ASAP! Will give brainliest to whoever answers these correctly.

erastovalidia [21]

Answer:

The answer to your question is below

Step-by-step explanation:

23.- According to the picture I can conclude that is an isosceles triangle,

then, 45° = 2 so

45° = x + 60

x = 45 - 60

x = -15

24.- This is also an isosceles triangle, then, 2 = 74

3x - 4 = 32 2x 74 = 148

3x = 32 + 4 180 - 148 = 32 = 3x - 4

3x = 36

x = 12

25.- This is an equilateral triangle, then,

60 = 7x - 10

60 + 10 = 7x

70 = 7x

x = 70/7

x = 10

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yanalaym [24]

Answer:

m^1/15

Step-by-step explanation:

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3 years ago

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timurjin [86]

Answer:

x + 6 + x + 6 + x + 6 + x + 6 + x + 6 x + 6 + x + 6 + x + 6 = 120

aka 8(6 + x) = 120

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8x = 72

now you want the x by its self so to undo multiplication you need to divide, and divide on both sides.

x = 9

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