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Veseljchak [2.6K]
3 years ago
8

Need help with problem 20 and 22.

Mathematics
1 answer:
AlexFokin [52]3 years ago
5 0
20 is permutation
22 is counting principle
Hope it help.
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ABC is a triangle right angled at A and D is a point on BC such that AD Ʇ BC. Show that AD2 = BD x DC. please answer fast URGENT
postnew [5]

Answer:

The answer is below

Step-by-step explanation:

Pythagoras theorem states that for a right angled triangle, the square of the hypotenuse side is equal to the sum of the square of the remaining sides. The hypotenuse is the longest side (that is side opposite to the 90° angle).

In right angle triangle ABD:

AB² = AD² + BD²     (1)

In right angle triangle ACD:

AC² = AD² + CD²      (2)

Also:

AC² + AB² = BC²       (3)

But BC = BD + CD

AC² + AB² = (BD + CD)²     (4)

Adding equation 1 and 2 gives:

AB² + AC² = (AD² + BD²) + (AD² + CD²)  

AB² + AC² = 2AD² + BD² + CD²

substituting AC² + AB² = (BD + CD)²:

(BD + CD)² = 2AD² + BD² + CD²

BD² + 2(BD)(CD)+ CD² = 2AD² + BD² + CD²

2AD² = 2(BD)(CD)

AD² = BD * CD

6 0
3 years ago
10 ft<br> А<br> - “不<br> 6 ft<br> v<br> 10 ft -<br> 12 ft<br> B<br> C | 12 ft<br> 4 ft<br> 4 ft
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Answer:

58

Step-by-step explanation:

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The mean hourly salary of the 10 employees at a fast­food restaurant is $8.25. One of the employees earning $6.50 an hour leaves
IgorC [24]
You would add $8.25 + $5.50, which equals $13.75. Then you would divide that number by the number of employees currently working at the fast food restaurant; $13.75 / 2 = $6.875. So, $6.88 would be the new mean salary of the employees.
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Bigideasmath.
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The total number of calories for 18 cups of milk is 1620 calories.
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The table below represents the height of a bird above the ground during flight, with p(t) representing height in feet and t repr
ddd [48]

Answer:

3.23

Step-by-step explanation:

6.26+6+3.41=15.67

15.67/7=3.23

I have mentioned time 7 sec from 3 to9

8 0
3 years ago
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