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2 years ago

Could someone explain to me how to solve these questions?

Mathematics

1 answer:

Nina [5.8K]2 years ago

3 0

Answer:

you combine the numbers that are the same and see the signs if it's positive with the negative, it's going to be negative

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12a - 6 + 7a - 2a ; a = 4<br> Need help please

Novosadov [1.4K]

Answer:

Step-by-step explanation:

Plug in the value of a in the equation:

12(4) - 6 + 7(4) - 2(4)

Solve 12(4) - 6:

12(4) - 6 = 48 - 6 = 42

Solve 7(4) - 2(4):

7(4) - 2(4) = 28 - 8 = 20

Combine both answers (42+20):

42+20 = 62

Complete answer:

12(4) - 6 + 7(4) - 2(4) = 62

3 0

3 years ago

Circle O, with center (x, y) passes through the points A(0, 0), B(-3, 0), and C(1, 2). Find the coordinates of the center of the

KonstantinChe [14]

Answer:

The center of the circle is

$(-\frac{3}{2},2)$

Step-by-step explanation:

Let the equation of the circle be

$x^2+y^2+2ax+2by+c=0$ , where (-a,-b) is the center of this circle.

The points lying the circle must satisfy the equation of this circle.

A(0,0)

We substitute this point to get;

$0^2+0^2+2a(0)+2b(0)+c=0$

$\implies c=0$

B(-3,0)

$(-3)^2+0^2+2a(-3)+2b(0)+c=0$

$\implies 9+0-6a+0+c=0$

$\implies -6a+c=-9$

But c=0

$\implies -6a=-9$

$\implies a=\frac{3}{2}$

C(1,2)

$1^2+2^2+2a(1)+2b(2)+c=0$

$1+4+2a+4b+c=0$

$2a+4b+c=-5$

Put the value of 'a' and 'c' to find 'b'

$2(\frac{3}{2})+4b+0=-5$

$3+4b+0=-5$

$4b=-5-3$

$4b=-8$

b=-2

Hence the center of the circle is

$(-\frac{3}{2},2)$

8 0

3 years ago

Please find Area of triangle

horrorfan [7]

Answer:

Step-by-step explanation:

Side A would end up being 15 and then to find the area you would use your formula 1/2 × base × height.

4 0

2 years ago

Please help me with my classwork

marshall27 [118]

Answer:

Use calculator

Step-by-step explanation:

Use your calculator, put the number in front of the square root, then use 2nd then hit the button below math to get the square root on your calculator.

4 0

3 years ago

The geometric average of -12%, 20%, and 25% is _________.

Grace [21]

<span>20.28% is the answer</span>

8 0

2 years ago