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damaskus [11]
3 years ago
9

What is 3+ 42/-2-4(-2)

Mathematics
2 answers:
mafiozo [28]3 years ago
6 0

Answer:

The correct answer is - 10

Step-by-step explanation:

3 + 42/-2 - (4) (- 2)

= 3 + - 21 - (4) (- 2)

+ - 18 - (4) (- 2)

= - 18 - (- 8)

= - 10

Hope this helps!

zlopas [31]3 years ago
5 0

Answer:

-10

Step-by-step explanation:

42/-2 = -21

-4(-2) = 8

3+-21+8 = -10

Hope this helps!

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45 is 20% of what number?
nadezda [96]
x-\ number\\\\
20\%x=45\\\\
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0.2x=45\ \ \ | divide\ by\ 0.2\\\\
x=225\\\\
45\ is\ 20\% \ of\ 225.
5 0
4 years ago
B-4/6=b/2 solve for b
DIA [1.3K]
First you cross multiply.

2*(b-4)=6b

Then distribute the 2.

2b-8=6b

Minus 2b from each side.

-8=4b

Divide each side by 4.

-2=b

So -2 is your answer.
8 0
3 years ago
Can someone please answer this!
Rus_ich [418]

Answer:

Answer is 49

Step-by-step explanation:

Add all the ratios up you get 21 so then you divide 147 by 21 thus giving you 1 ratio = 7 respectively, and we know the ratio of the red is 7 because it's stated red, blue, and green -> 7,6,8. So then 7 * 7 = 49. And to confirm you can do (7*7)+(6*7)+(8*7) which should equal 147

7 0
3 years ago
Read 2 more answers
Find an equation of the sphere that passes through the origin and whose center is (-2, 2, 3). Be sure that your formula is monic
Andrei [34K]

Answer:

\bold{(x+2))^2+(y-2)^2+(z-2)^2=17}

Step-by-step explanation:

Given the center of sphere is: (-2, 2, 3)

Passes through the origin i.e. (0, 0, 0)

To find:

The equation of the sphere ?

Solution:

First of all, let us have a look at the equation of a sphere:

(x-a)^2+(y-b)^2+(z-c)^2=r^2

Where (x,y,z) are the points on sphere.

(a, b, c) is the center of the sphere and

r is the radius of the sphere.

Radius of the sphere is nothing but the distance between any point on the sphere and the center.

We are given both the points, so we can use distance formula to find the radius of the given sphere:

D = \sqrt{(x_2-x_1)^2+(y_2-y_1)^2+(z_2-z_1)^2}

Here,

x_1 =0 \\y_1 =0 \\z_1 =0 \\x_2 =-2 \\y_2  =2 \\z_2 =3

So, Radius is:

r = \sqrt{(-2-0)^2+(2-0)^2+(3-0)^2}\\\Rightarrow r = \sqrt{4+4+9} = \sqrt{17}

Therefore the equation of the sphere is:

(x-(-2))^2+(y-2)^2+(z-2)^2=(\sqrt{17})^2\\\bold{(x+2))^2+(y-2)^2+(z-2)^2=17}

4 0
4 years ago
7. 20% of what number is 18?​
Tom [10]
The answer is 90

20%of 99=18
8 0
3 years ago
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