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3 years ago

6. Simplify: 15 + 10 - 8-2 +3 - 4 - 1

Mathematics

2 answers:

agasfer [191]3 years ago

8 0

Answer:

Step-by-step explanation:

15 + 10 = 25

25 - 8 = 17

17 - 2 = 15

15 + 3 = 18

18 - 4 = 14

14 - 1 = 13

Vitek1552 [10]3 years ago

4 0

Answer:

Step-by-step explanation:

its 13

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A sound wave travels through iron at a rate of 5120\,\dfrac{\text{m}}{\text{s}}5120

Jet001 [13]

The rate at which the sound travels in km/hr is 0.142km/hr

<h3>Conversion of m/s to km/hr</h3>

If a sound wave travels with a speed of 5120m/s, in order to convert to km/he, we will use the conversion factor below;

1hr = 3600secs

1km = 1000m

Using the conversion factor in our dimensional analysis

5120m/s = 5120m/1s * 1km/1000m * 3600s/1hr

5120m/s = 5120m/3600000

5120m/s = 0.142km/hr

Hence the rate at which the sound travels in km/hr is 0.142km/hr

learn more on dimensional analysis here: brainly.com/question/21510595

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6 0

2 years ago

A rectangular movie screen has side lengths of 7 meters and 9 meters. The size of a screen is determined by its diagonal. Of th

GaryK [48]

Answer= 11
Explanation= i plugged it into a calculator

4 0

3 years ago

Read 2 more answers

V(x + 9)2 = + 25<br> If x + 9 = 5, then x =<br> If x + 9 = -5, then x =

ipn [44]

Answer:

x = -4, v = 2.5

x = -14, v = -2.5

Step-by-step explanation:

I am a bit confused with the beginning part of the question. From what I understand, you are trying to solve for x and then plug x into the top equation to find the value for V. I am sorry if that is not what you are looking for. If it is, look below!

x + 9 = 5

x = 5 -9

x = -4

v(x + 9)2 = 25

v(-4 + 9)2 = 25

v(5)2 = 25

v(10) = 25

v = 25/10

v = 2.5

x + 9 = -5

x = -5 -9

x = -14

v(x + 9)2 = 25

v(-14 + 9)2 = 25

v(-5)2 = 25

v(-10) = 25

v = 25/(-10)

v = -2.5

I hope this helped! If not, I am sorry. :(

4 0

3 years ago

A student decides to sort out her new study timetable. She suggests two plans however is confused about which is more efficient.

Viktor [21]

Answer:

Plan B

Step-by-step explanation:

Plan A: 15 days per subjet

Plan B: 9 days per subject.

(I am so sorry if this math is actually wrong. It's very late where I am.)

3 0

3 years ago

Let line $l_1$ be the graph of $5x + 8y = -9$. Line $l_2$ is perpendicular to line $l_1$ and passes through the point $(10,10)$.

SashulF [63]

Answer:

m + c = - 4.4

Step-by-step explanation:

Line 1 is given by the equation 5x + 8y = -9, ⇒ $y = - \frac{5}{8} x - \frac{9}{5}$ ........(1) {In slope-intercept form}

If line 2 is perpendicular to the line 1 then the equation of line 2 will be

$y = \frac{8}{5} x + c$ ........ (2), where c is a constant. {Since the product of the slopes of two perpendicular straight line is -1}

Now, the line 2 passes through the point (10,10).

So, from equation (2), we get,

$c = y - \frac{8}{5} x = 10- \frac{8 \times 10}{5} = - 6$

Therefore, the equation of line 2 will be $y = \frac{8}{5} x - 6$

This equation is in y = mx + c form where $m = \frac{8}{5} = 1.6$ and c = - 6

Hence, m + c = 1.6 - 6 = - 4.4 (Answer)

7 0

3 years ago