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2 years ago

Solve the equation using the square root property. Show your work, please! 5x^2 + 80 = 0

Mathematics

1 answer:

Phantasy [73]2 years ago

4 0

Answer:

Isolate the variable by dividing each side by factors that don't contain the variable.

x = 4 i, - 4 i

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pav-90 [236]

Answer:

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2 years ago

How many triangles and quadrilaterals altogether can be formed using the vertices of a 7-sided regular polygon?

MAVERICK [17]

Answer: The correct option is

(E) 70.

Step-by-step explanation: We are given to find the number of triangles and quadrilaterals altogether that can be formed using the vertices of a 7-sided regular polygon.

To form a triangle, we need any 3 vertices of the 7-sided regular polygon. So, the number of triangles that can be formed is

$n_t=^7C_3=\dfrac{7!}{3!(7-3)!}=\dfrac{7\times6\times5\times4!}{3\times2\times1\times4!}=35.$

Also, to form a quadrilateral, we need any 4 vertices of the 7-sided regular polygon. So, the number of quadrilateral that can be formed is

$n_q=^7C_4=\dfrac{7!}{4!(7-4)!}=\dfrac{7\times6\times5\times4!}{4!\times3\times2\times1}=35.$

Therefore, the total number of triangles and quadrilaterals is

$n=n_t+n_q=35+35=70.$

Thus, option (E) is CORRECT.

8 0

2 years ago

What are the zeros of this function? look at graph a. b. c. d.

fredd [130]

The zeros of the function occur when the graph meet the x-axis so in this case the zeros occur at B ( 0 and 5)

4 0

2 years ago

Help pls to get brainiest

Illusion [34]

Answer:

x= -3

Step-by-step explanation:

3 0

2 years ago

Read 2 more answers

Select the locations on the number line to plot the points 9/2 and −7/2 .

myrzilka [38]

To plot these points on the number line, you should label the long lines on the number line as such starting from the left (-5-already there, -4,-3,-2,-1,0,1,2,3,4,5-already there).

Now take each number and convert the improper fraction into a mixed number. 9/2 = 4 1/2 and -7/2 = -3 1/2.

4 1/2 would plotted on the line exactly in between the 4 and 5.

-3 1/2 would be plotted on the line exactly halfway between -3 and -4.

You will draw a dot to show each of these positions on a number line.

8 0

2 years ago

Read 2 more answers