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MA_775_DIABLO [31]
3 years ago
9

The mean of Fred’s grades on five tests was 75.2. The grades on the first 4 of these tests were 87, 84, 88, and 45. Find the gra

de on his fifth test.
Mathematics
2 answers:
love history [14]3 years ago
7 0

Answer:

72

Step-by-step explanation:

mean x number of total test scores -> 75.2 x 5=376

sum of the four test scores given -> 304

difference of the two numbers -> 376- 304= 72

the missing test score, therefore the answer is 72.

kaheart [24]3 years ago
5 0
88+87+84+45 = 304
304+x/5=75.2
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-Dominant- [34]
We know that

 in the triangle TQS
<span>applying the Pythagorean theorem
QS</span>²=TS²+TQ²---------> TQ²=QS²-TS²--------> TQ²=18²-9x²-----> equation 1

in the triangle TRS
TS²=TR²+RS²--------------> TR²=TS²-RS²-------> TR²=9x²-144----> equation 2

in the triangle QTR
TQ²=TR²+36-----------> equation 3


<span>I substitute 1 and 2 in 3
</span>18²-9x²=9x²-144+36--------> 18x²-432=0------> x²=24-------> x=√24
x=2√6
TS=3*x------> 3*2√6-----> 6√6
TS=6√6 units

the answer is
TS=6√6 units 
<span>6 is the square root of 6 units</span>
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3 years ago
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Please answer as quick as you can! <br><br> Answer questions 1-3 please!
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1) his time would have to be less than 11.54
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2 years ago
Help me i really need this .no spam​
Naya [18.7K]

<u>Question</u> : 8

11 \sqrt{5}  + 4 \sqrt{7}

<u>Question</u> : 9

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<u>Question</u> : 11

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Nadusha1986 [10]

Answer:

1. Yes

2. They could change the 60° angle into a different one.

Step-by-step explanation:

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ira [324]

Hey there! I'm happy to help!

First, let's find the radius. The radius is half of the diameter.

8.4/2=4.2

Here's how to find the area of a circle.

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And multiply by pi (3.14 in our case)

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We round to the nearest tenth, giving us an area of 55.4 ft²

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