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neonofarm [45]
3 years ago
6

How do I do proofs? ​

Mathematics
1 answer:
Neko [114]3 years ago
7 0
Is this algebra? What type of Math this
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Sally was standing 30 feet from a tree. The angle of
QveST [7]

Answer: The tree was 27 feet tall

Step-by-step Explanation: First of all Sally was standing 30 feet away from the tree and she looks up at an angle of elevation of 38 degrees to the top of the tree. With this bit of information we can determine that a right angled triangle has been formed with the reference angle as 38 degrees, the side facing it as h (the height of the tree) and the adjacent side as 30. We shall apply the trigonometric ratio as follows;

Tan 38 = opposite/adjacent

Tan 38 = h/30

0.7813 = h/30

0.7813 x 30 = h

23.4 = h

We remember at this point that Sally’s eyes were 4 feet above the ground. What we have just calculated is the height of the tree from “4 feet above the ground” (where her eyes were). Hence the actual height of the tree is calculated as 23.4 plus 4 which gives us 27.4

Therefore the tree was 27 feet tall (approximately to the nearest foot)

5 0
3 years ago
This is the formula for the volume of a right square pyramid, where a is the side length of the base and h is the height: . Whic
Lesechka [4]

Answer:

C. h=3V/a^2 is the correct answer

Step-by-step explanation:

Given:

V=1/3a^2h

It can be rewritten as

V=1/3 *( a^2) * h

Divide both sides by (1/3)*h

V / (1/3*h) = (1/3)* (a^2) * h / (1/3)*h

V÷1/3*h = a^2

V÷3/1*h=a^2

3V/h=a^2

Multiply both sides by h

3V/h*h=h*a^2

3V=h*a^2

h=3V/a^2

C. h=3V/a^2 is the correct answer

7 0
3 years ago
A rectangle has an area of 24 in.2. A similar figure is drawn with side lengths 3 times greater in length. How does the area of
Anna71 [15]

Answer:

.Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
At dinner, the number of quarts of water the restaurant sells is 36 fewer than twice as many as it sells at lunch. The restauran
Natasha2012 [34]
Let x be the number of quarts of water it sells at lunch

Dinner = 2x - 36

Lunch = 2x

2x + 2x - 36 = 4x - 36

4x - 36 = 144

144 - 36 = 4x

4x = 108

x = 108 divided by 4 = 27

2x = 27 x 2 = 54

The restaurant sells 54 quarts of water at lunch.
5 0
3 years ago
Read 2 more answers
The mass of Planet X is 8.46 x 10^22 kilograms. The mass of Planet Y is
Lorico [155]

Answer:

A. 5,21

B. 8,22

C. 16

Step-by-step explanation:

4 0
2 years ago
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