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Anton [14]
4 years ago
15

What is the solution to the system of equations below?

Mathematics
1 answer:
AnnyKZ [126]4 years ago
8 0

Answer:

x=9, y=3

Step-by-step explanation:

-4x+6y=-18

y=-2x+21

-4x+6(-2x+21)=-18

-4x-12x+126=-18

144=16x

x=9

y=-2x+21

y=-18+21

y=3

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Please answer asap!!!!
galina1969 [7]

Answer:

B. 126 degrees

Step-by-step explanation:

lets say the angle is x

the equation we have here is the 8th graders divided by the total number of students is equal to x divided by 360 degrees since a circle has a 360 degree angle.

The equation is:

350/1000=x/360

in number form.

350/1000= 0.35 = 35%

so now we know x/360=35%

126/360=35%

so the answer would be 126 degrees.

<em>Hope that was helpful, if it was please rate it for anyone else who is asking the same question.</em>

4 0
3 years ago
A bank PIN is a string of four digits, each digit 0-9. (a) How many choices are there for a PIN if the last digit must be odd? M
Amanda [17]

Answer:

a) 5,000 b) 3,600

Step-by-step explanation:

a) there are four different slots, and for the first three slots there are a possibility for 10 different numbers and in the last slot there can only be 5 different numbers. So you get 10 x 10 x 10 x 5 which leaves you with 5,000 possibilities

b) the same thing as above but know you have fewer numbers 10 x 9 x 8 x5 which gives you 3,600 possibilities

7 0
4 years ago
What is the domain and range of the function f(x)= 1/x
BaLLatris [955]

Answer:

the domain is x and the range is 1

Step-by-step explanation:

8 0
3 years ago
1/2r + 2 (3/4r - 1) = 1/4r + 6<br><br>​
gtnhenbr [62]

Answer:

r=32/7

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
The volume of a cone is 1540cm³. If its radius is 7cm, calculate the height of the cone. (Take pi = 22/7)
Ann [662]

Answer:

h=30

Step-by-step explanation:

Volume of a cone=1540cm^{3}, Radius=7cm.

The height of a cone=h

When we need to find the height of a cone, we can use the formula of the volume of a cone, which is \frac{1}{3} \pi r^{2} h to find the height of a cone.

1540cm^{3} =\frac{1}{3}\pi r^{2}  h

Put the pi value=22/7 and the value of radius which is 7 cm into the formula.

1540cm^{3}=\frac{1}{3}*\frac{22}{7}  7^{2}h

1540cm^{3} =\frac{154}{3}h

Move \frac{154}{3} to another side. 1540 divided by  \frac{154}{3} to calculate what is the value of h, h is the height of a cone. Like this.

\frac{1540cm^{3} }{\frac{154}{3} } =h

30=h

Rearrange the h.

h=30

I hope you will understand my solution and explanation. If you still cannot get the point, you can ask me anytime! Thank you!

4 0
3 years ago
Read 2 more answers
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