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3 years ago

Is - 20 x - 18 positive or negative ?

Mathematics

2 answers:

Minchanka [31]3 years ago

5 0

Answer:

its positive

Step-by-step explanation:

liraira [26]3 years ago

3 0

Step-by-step explanation:

<u>Step 1: Find the answer</u>

A negative times another negative gives us a positive. If you put it into your calculator as -20 * -18, you will get the answer of 360.

Answer: Positive

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A sector of a circle makes a 127° angle at its centre. If the arc of the sector has length 36 mm, find

Veseljchak [2.6K]

Answer:

Approximately $68.5\; \rm mm$ .

Step-by-step explanation:

Convert the angle of this sector to radians:

$\begin{aligned}\theta &= 127^{\circ} \\ &= 127^{\circ} \times \frac{2\pi}{360^{\circ}} \\ &\approx 2.22\end{aligned}$ .

The formula $s = r\, \theta$ relates the arc length $s$ of a sector of angle $\theta$ (in radians) to the radius $r$ of this sector.

In this question, it is given that the arc length of this sector is $s = 36\; \rm mm$ . It was found that $\theta = 2.22$ radians. Rearrange the equation $s = r\, \theta$ to find the radius $r$ of this sector:

$\begin{aligned} r&= \frac{s}{\theta} \\ &\approx \frac{36\; \rm mm}{2.22} \\ &\approx 16.2\; \rm mm\end{aligned}$ .

The perimeter of this sector would be:

$\begin{aligned}& 2\, r + s \\ =\; & 2 \times 16.2\; {\rm mm} + 36\; {\rm mm} \\ =\; & 68.5\; \rm mm\end{aligned}$ .

8 0

3 years ago

1.2/4.4 = 3/a what is a

bazaltina [42]

Simply cross multiply and simplify to get a = 11

Hope this helped!! xx

7 0

4 years ago

Read 2 more answers

You practice piano for 50 minutes each weekday and for 40 minutes on each weekend day. how many hours per week do you practice?

Pavel [41]

Answer:

330 minutes a week

Step-by-step explanation:

50 x 5= 250 then add 80 because 40 x 2 is 80 and get 330

5 0

3 years ago

Read 2 more answers

15%of 250 <br> Pls give and step by step

pychu [463]

Answer:

Step-by-step explanation:

15% = 15/100 = .15

250 x .15 = 37.5

5 0

3 years ago

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Use the diagram to find the height of statue.round to the nearest tenth

jeyben [28]

Answer:

7.3 ft

Step-by-step explanation:

The information given represents a right angle triangle with the following:

reference angle = 52°

Adjacent side length = 5.7 ft.

Opposite side length = height of the statue = h

Applying the trigonometric ratio formula, we would have:

$tan(52) = \frac{h}{5.7}$

Multiply both sides by 5.7

$tan(52) \times 5.7 = \frac{h}{5.7} \times 5.7$

$tan(52) \times 5.7 = h$

$h = 7.3 ft$ (nearest tenth)

6 0

3 years ago