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3 years ago

I need help on this:(

Mathematics

1 answer:

Alex Ar [27]3 years ago

3 0

Answer:

Not to sure if this is correct but I think it is 6: 1 : 18

pls msg me if you need explanation

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If M(-2,8) is reflected in the y-axis what are the coordinates of M , the image M

Ludmilka [50]

Answer:

If it was reflected over the y-axis, the x variable would be inverted, causing the coords to be M(2,8)

7 0

3 years ago

What is 5x+3y=8x-7y when trying to find x it's Geo math

Novosadov [1.4K]

Rearrange this equation 5x+3y=8x-7y so that all x terms are on one side and all y terms are on the other:
10y
5x+3y=8x-7y => 10y = 3x, and x = ----------
3

3 0

4 years ago

Read 2 more answers

Find the measure of each angle in degrees and radians.

Paul [167]

Problem 9

This is not correct. It would be correct if the longer arc mark was not there. However, because it is there, you have to travel 360-30 = 330 degrees in the negative direction. So the angle shown along that arc is -330 degrees which converts to -11pi/6 radians.

====================================

Problem 10

The spiral arc almost wraps itself around 2 times over, effectively almost making two full revolutions.

1 revolution = 2pi radians

2 revolutions = 4pi radians (multiply both sides by 2)

Subtract off pi/3

4pi - pi/3 = 12pi/3 - pi/3 = 11pi/3

11pi/3 represents the radian measure of the spiral arc

Convert to degrees

11pi/3 radians = (11pi/3)*(180/pi)

11pi/3 radians = (11/3)*180

11pi/3 radians = 11*180/3

11pi/3 radians = 11*60

11pi/3 radians = 660 degrees

====================================

Problem 11

Add pi/2 radians to the angle measure shown

pi/2 + 7pi/18 = 9pi/18 + 7pi/18

pi/2 + 7pi/18 = 16pi/18

pi/2 + 7pi/18 = 8pi/9

The full angle in radians is 8pi/9 radians

Now convert to degrees

8pi/9 radians = (8pi/9)*(180/pi)

8pi/9 radians = (8/9)*180

8pi/9 radians = 8*180/9

8pi/9 radians = 8*20

8pi/9 radians = 160 degrees

====================================

Problem 12

Add pi/2 radians (aka 90 degrees) to pi/9 to get

pi/2 + pi/9 = 9pi/18 + 2pi/18

pi/2 + pi/9 = 11pi/18

This represents the red angle shown in the diagram below.

Subtract this found angle from 4pi, which represents 2 full revolutions

4pi - 11pi/18 = 72pi/18 - 11pi/18

4pi - 11pi/18 = 61pi/18

The spiral mark shown in the diagram is 61pi/18 radians

Convert to degrees

61pi/18 radians = (61pi/18)*(180/pi)

61pi/18 radians = (61/18)*180

61pi/18 radians = 61*180/18

61pi/18 radians = 61*10

61pi/18 radians = 610 degrees

8 0

3 years ago

What is the equation of the circle in standard form see attachment

Elodia [21]

Center (-1,1), radius 5 so

$(x - -1)^2 + (y - 1)^2 = 5^2$

$(x+1)^2 + (y-1)^2 = 25$

Third choice

7 0

4 years ago

Read 2 more answers

If ab = 9 and a² + b² = 81, then (a+b)² = ?

Andre45 [30]

Answer:

Step-by-step explanation:

Through some clever algebra, we can combine our first two equations using the fact that

$(a+b)^2=a^2+2ab+b^2$

We have the a² and the b² in the equation $a^2+b^2=81$ , and we almost have a 2ab in the equation $ab=9$ . To get that 2ab, we can simply double both sides of the first equation to get $2ab=18$ . From there, we'll add the first two equations together, giving us the summed equation

$a^2+b^2+2ab=81+18\\a^2+2ab+b^2=99$

And since $(a+b)^2=a^2+2ab+b^2$ , we can equivalently say that

$(a+b)^2=99$

5 0

3 years ago