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3 years ago

Estimate the sum or difference 4/5 + 18/20 (1 point) 1. 1 2. 1 1/2 3. 2

Mathematics

1 answer:

Vlada [557]3 years ago

7 0

Answer:

$2) \: \: \frac{11}{2}$

Step-by-step explanation:

$\frac{4}{5} + \frac{18}{20} \\ \\ \frac{4}{5 \times 4} + \frac{18}{20} \\ \\ \frac{4}{20} + \frac{18}{20} \\ \\ \frac{4 + 18}{20} \\ \\ \frac{22}{20} \\ \\ \frac{11}{2}$

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Which set of points is not coplanar?

spin [16.1K]

we know that

Coplanar points are three or more points which lie in the same plane. Remember that a plane is a flat surface which extends without end in all directions. Any three points in 3-dimensional space determine a plane.

case a) points A, B, E

Any group of three points determines a plane

The points A,B,E are coplanar

case b) points A, B,C,E

The four points do not belong to the same plane

The points A,B,C,E are not coplanar

case c) points B, C, D

Any group of three points determines a plane

The points B, C, D are coplanar

case d) points A,B, C, D

The base of the pyramid is a flat surface, the four points lie in the same plane

The points A,B, C, D are coplanar

therefore

the answer is the option

points A, B, C, E are not coplanar

8 0

4 years ago

Read 2 more answers

What is the value of x? enter your answer in the box.

Mamont248 [21]

Answer:

if 9x8 =72

then 56/8= 7

x=7

8 0

3 years ago

these lines shown below are parallel. if the green line has a slope of -2, what is the slope of the red line?

Wittaler [7]

I think it should be +2

5 0

4 years ago

Please help on this one

Margarita [4]

For the first inequality, subtract 5 from both sides to get

$x \geq -2$

For the second inequality, subtract 1 from both sides to get

$6x < -30$

Divide both sides by 6:

$x < -5$

So, x has to be greater than or equal to -2, or less than -5, which is option D

6 0

3 years ago

6x + 12 = 10x − 4 1. Solve for x using two different methods

solong [7]

Answer:

x=53/4 or 4x=53

Step-by-step explanation:

First move the variable to the left-hand side and change its sign.

6x+12-10x=-41 to 6x-10x=-41-12

Then collect the like terms

6x-10x=-41-12 to -4x=-41-12 which equals to -4x=-53

Now you divide both sides of the equation by -4

-4x=-53 to x=53 over 4 then if you want you divide which gives you x=13.25

Second way:

Kind of the same thing as the first one

Move the variable to the left-hand side and change its sign

6x+12=10x-41 to 6x=12-10x=-41

Then you collect the like terms

6x-10x=-41-12 to -4x=-41-12

Now you multiply both sides of the equation by -1

-4x=-53 to 4x=53

5 0

3 years ago