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guajiro [1.7K]
3 years ago
11

How to add and subtract positive and negative numbers?

Mathematics
1 answer:
mina [271]3 years ago
4 0
Negative and negative equals a positive and positive and a negative equals a negative and then positive and positive equals positive hopefully that helped

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Forces of 9 lbs and 13 lbs act at a 38º angle to each other. Find the magnitude of the resultant force and the angle that the re
fiasKO [112]

Answer: R=20.84\ lb\quad 22.57^{\circ},15.43^{\circ}

Step-by-step explanation:

Given

Two forces of 9 and 13 lbs acts 38^{\circ} angle to each other

The resultant of the two forces is given by

\Rightarrow R=\sqrt{a^2+b^2+2ab\cos \theta}

Insert the values

\Rightarrow R=\sqrt{9^2+13^2+2(9)(13)\cos 38^{\circ}}\\\Rightarrow R=\sqrt{81+169+184.394}\\\Rightarrow R=\sqrt{434.394}\\\Rightarrow R=20.84\ lb

Resultant makes an angle of

\Rightarrow \alpha=\tan^{-1}\left( \dfrac{b\sin \theta}{a+b\cos \theta}\right)\\\\\text{Considering 9 lb force along the x-axis}\\\\\Rightarrow \alpha =\tan^{-1}\left( \dfrac{13\sin 38^{\circ}}{9+13\cos 38^{\circ}}\right)\\\\\Rightarrow \alpha =\tan^{-1}(\dfrac{8}{19.244})\\\\\Rightarrow \alpha=22.57^{\circ}

So, the resultant makes an angle of 22.57^{\circ} with 9 lb force

Angle made with 13 lb force is 38^{\circ}-22.57^{\circ}=15.43^{\circ}

7 0
3 years ago
Read 2 more answers
A number K increased by 10 is the same as 24 what’s the equation
polet [3.4K]
The equation is K + 10 = 24.
3 0
3 years ago
If the mean of this data is 95, find the missing data 103,99,90,86,105,96 what is the missing data
d1i1m1o1n [39]
Let, the missing number = x
Then, 103 + 99 + 90 + 86 + 105 + 96 + x / 7 = 95
579+x = 665
x = 665 - 579
x = 86

In short, Your Answer would be 86

Hope this helps!
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Help multiple choice but plz be right! Due soon
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Answer:

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Step-by-step explanation:

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7 0
3 years ago
Identify the type of triangles
Margarita [4]

answer 6cm , 3cm , 6cm, this the answer

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2 years ago
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