2 years ago

If x^2=-1, What is the value of x?

Mathematics

1 answer:

vodomira [7]2 years ago

7 0

Answer:

-1

Step-by-step explanation:

-1^2 = -1

You might be interested in

In an effort to determine whether any correlation exists between the price of stocks of airlines, an analyst sampled six days of

vovikov84 [41]

Answer:

Check the explanation

Step-by-step explanation:

Following table shows the calculations:

Delta, X Southwest , Y X^2 Y^2 XY

45.96 38.76 2112.3216 1502.3376 1781.4096

46.8 45.41 2190.24 2062.0681 2125.188

47.93 15.7 2297.2849 246.49 752.501

51.78 49.58 2681.1684 2458.1764 2567.2524

52.17 44.34 2721.7089 1966.0356 2313.2178

47.36 18 2242.9696 324 852.48

Total 292 211.79 14245.6934 8559.1077 10392.0488

Sample size: n =6

Now

$S_{yy}=\sum y^{2}-\frac{\left (\sum y \right )^{2}}{n}=1083.27$

$S_{xx}=\sum x^{2}-\frac{\left (\sum x \right )^{2}}{n}=35.03$

$S_{xy}=\sum xy-\frac{\left (\sum x \right )\left (\sum y \right )}{n}=84.94$

The coefficient of correlation is :

$r=\frac{S_{xy}}{\sqrt{S_{xx}S_{yy}}}=0.436$

7 0

3 years ago

Simplify the expression.<br> (4a- 80 - 4a2) + (7a3 - 7 - 6a)

allsm [11]

Answer:

the answer should be 7a^3-4a^2-2a-87

3 0

3 years ago

Surface area for a net

dolphi86 [110]

Finding the areas of each of the rectangles and squares of the net of a rectangular prism and adding up those areas gives the surface area or total surface area of the prism. For example, if the length of one side of the cube 4 units then the area of one its face is 4 × 4 = 16 square units.

8 0

3 years ago

At an animal shelter there are 15 dogs 12 cats 3 snakes and 5 parakeets what percent less parakeets are there than dogs

vlabodo [156]

About 29%
hope it helps

3 0

3 years ago

Rewrite the following question in Standard form <br> Y=7/3x+8/5

BartSMP [9]

15y = 7x + 8
15y - 7x - 8 = 0

i am a mathematics teacher. if anything to ask please pm me

3 0

3 years ago