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Pavel [41]
3 years ago
8

If y varies directly with x, and y=-1 when x=3

Mathematics
1 answer:
UNO [17]3 years ago
4 0

Answer:

where da question at

Step-by-step explanation:

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Which of the following could be the ratio of the length of the longer leg of a 30-60-90 to the length of its hypotenuse? CHECK A
8_murik_8 [283]

Answer:

A. √3 : 2

D. 3√3 : 6

Step-by-step explanation:

In a triangle described as 30°-60°-90° triangle, the base angles are 90° and 60°

The side with angles 90° and 60° is the shortest leg and can be represented by 1 unit

The hypotenuse side is assigned a value twice the shorter leg value, which is 2 units

From Pythagorean relationship; the square of the hypotenuse side subtract the square of the shorter leg gives the square of the longer side

This is to say if;

The given the shorter leg = 1 unit

The hypotenuse is twice the shorter leg= 2 units

The longer leg is square-root of the difference between the square of the hypotenuse and that of the shorter leg

=2^2-1^2\\\\=4-1=3\\\\\\b^2=3\\\\\\b=\sqrt{3}

where the longer leg is represented by side b in the Pythagorean theorem, the hypotenuse by c and the shorter leg by a to make;

a^2+b^2=c^2

<u>Hence the summary is</u>

a=shorter leg= 1 unit

b=longer leg = √3 units

c=hypotenuse=2 units

The ratio of longer leg to its hypotenuse is

=√3:2⇒ answer option A

This is the same as 3√3:6 ⇒answer option D because you can divide both sides of the ratio expression by 3 and get option A

=3\sqrt{3} :6\\\\\\\frac{3\sqrt{3} }{3} :\frac{6}{3} \\\\\\=\sqrt{3} :2

Answers are :option A and D

4 0
3 years ago
Use substitution to solve the system. <br><br><br> X= 2y-5<br> 4x+3y=-9
sergey [27]

Step-by-step explanation:

x=2y-5 - equation 1

4x+3y=-9 -equation 2

Replace equation 1 in equation 2

4(2y-5)+3y=-9

8y-20+3y=-9

11y=-9+20

11y=11

y=11/11

y=1

If y=1, therefore x=2(1)-5=-3

x=-3,y=1

6 0
3 years ago
HELP!! 25Points WILLMARKBRAINLIEST What is the volume of the composite figure shown below?
Lorico [155]

Answer:

B

Step-by-step explanation:

the top one is...

(14 * 30 * 36)

the bottom one is..

(16 * 18 * 30)

3 0
3 years ago
Two airplanes leave an airport at the same time, one going NW bearing 135 degrees at 415mph and the other going east at 327 mph.
arsen [322]

Find the distances of each plane for the 4 hours, then use the law of cosine.

See attached picture:

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You and three friends go out for dinner. The bill comes to $77. If you pay $20 and your three friends all ordered the exact same
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F = (77-20)/3
f=57/3
f=19
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