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4 years ago

I don't understand this

Mathematics

1 answer:

nordsb [41]4 years ago

3 0

Answer: m<DEA = 95° also

Step-by-step explanation: I took geometry last year and I don’t remember the exact name of the explanation but both of the angles are equal

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there are 30 students in ms. McClendon's science class. of the students: 1/2 completed their homework, 40% said there dog ate th

Lina20 [59]

Answer: 10% were missing

Step-by-step explanation:

30 Students = 100% FYI in the problem

1/2 = 50%

50% + 40% = 90%

100% - 90% = 10%

Hope this helps.

3 0

3 years ago

An engineer, in an attempt to make a quick measurement, walks 100 ft from the base of an overpass

Korvikt [17]

Answer:

The distance of the overpass above the ground is approximately 26.795 ft

Step-by-step explanation:

The parameters given are;

The distance from the overpass the engineer stands before determining the angle of elevation of the overpass from his standing point = 100 ft

The angle of elevation of the overpass as determined by the engineer from 100 ft = 15°

By trigonometric ratios, we have;

$Tan(\theta) = \dfrac{Opposite \, side \, to\ angle}{Adjacent\, side \, to\, angle}$

The opposite side to the 15° angle of elevation in the above case is the distance of the overpass above the ground

The opposite side to the 15° is the distance of the engineer from the base of the overpass

Therefore;

Tan(15°) the height of the overpass=

length

$Tan(15 ^{\circ}) = \dfrac{The \ distance \, of \, the \ overpass \ above \ ground}{100 \ ft}$

The distance of the overpass above the ground = 100 × tan (15°) ≈ 26.795 ft.

6 0

3 years ago

Item 24 How many blocks do you need to add to Square 6 to get Square 7? To Square 9 to get Square 10? To Square 19 to get Square

kherson [118]

Answer:

You need to add 13 blocks to square 6 to get square 7

You need to add 19 blocks to square 9 to get square 10

You need to add 39 blocks to square 19 to get square 20

Step-by-step explanation:

* Lets explain how to solve the problem

- If we have two consecutive numbers n and (n + 1)

- Their squares are n² and (n + 1)²

- Lets find their difference

∵ Their difference = (n + 1)² - n²

- Solve the bracket (n + 1)²

∵ (n + 1)² = (n)(n) + 2(n)(1) + (1)(1)

∴ (n + 1)² = n² + 2n + 1

∴ Their difference = n² + 2n + 1 - n²

- Add the like terms

∴ Their difference = 2n + 1

- Lets use this rule to find the number of blocks we need to add to:

# square 6 to get square 7

∵ 6 and 7 are two consecutive numbers

∴ n = 6

∴ Their difference = 2(6) + 1 = 12 + 1 = 13

∴ You need to add 13 blocks to square 6 to get square 7

# square 9 to get square 10

∵ 9 and 10 are two consecutive numbers

∴ n = 9

∴ Their difference = 2(9) + 1 = 18 + 1 = 19

∴ You need to add 19 blocks to square 9 to get square 10

# square 19 to get square 20

∵ 19 and 20 are two consecutive numbers

∴ n = 19

∴ Their difference = 2(19) + 1 = 38 + 1 = 39

∴ You need to add 39 blocks to square 19 to get square 20

3 0

4 years ago

A gymnast trains for 4 months for her competition how many weeks did she train.

BaLLatris [955]

Answer:

16 weeks

Step-by-step explanation:

Assuming that each month is around 4 weeks, multiply that number by 4 months and you will get 16 weeks in total.

5 0

3 years ago

Read 2 more answers

Dominick weighs 30 pounds more than his sister. Together they weigh 330 pounds. How much does Dominick weigh?

german

Domik weights 30 pounds more than his sister

Together they weigh 330 pounds

Let "x" represent the weight of Dominik's sister, then his weight can be expressed as "x+30"

And their total weight can be calculated as:

$x+(x+30)=330$

From this expression you can calculate the value of x:

$\begin{gathered} 2x+30=330 \\ 2x+30-30=330-30 \\ 2x=300 \\ \frac{2x}{2}=\frac{300}{2} \\ x=150 \end{gathered}$

x=150 pounds

x+30=150+30=180 pounds

Dominik weights 180pounds and his sister 150 pounds

8 0

2 years ago

Read 2 more answers

I don't understand this​

I don't understand this