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3 years ago

99 points!! and brainliest plz try

Mathematics

2 answers:

vfiekz [6]3 years ago

6 0

Answer:

6 over 24 multiplied by 6 over 23

Step-by-step explanation:

GarryVolchara [31]3 years ago

3 0

Answer:

6 over 24 multiplied by 5 over 23

hope this helped!

Step-by-step explanation:

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(3-5i)(2+9i)+(7+2i)(7-2i)

kondor19780726 [428]

$i^{2} = -1$

-----------------------------------------

$(3-5i)(2+9i)+(7+2i)(7-2i) = \\ \\ = 6 + 27i - 10i - 45i^{2} + 49 - 14i + 14i - 4i^{2} = \\ \\ =55 + 17i + 45 + 4 = \boxed{104 + 17i}$

7 0

2 years ago

The mean age of 5 people in a room is 28 years.

lina2011 [118]

Answer:

174

Step-by-step explanation:

You should look at the mean and do this:

5*28 so now you know all the ages which is 140 now you do 140/29 and you get 4.8....... so you can see that the answer is 174

4 0

2 years ago

Solve the equations for all values of x by completing the square x^2+62=-16x

lorasvet [3.4K]

Answer:

$x = \sqrt{2} - 8\\x = -\sqrt{2} - 8$

Step-by-step explanation:

To complete the square, we first have to get our equation into $ax^2 + bx = c$ form.

First we add 16x to both sides:

$x^2 + 16x + 62 = 0$

And now we subtract 62 from both sides.

$x^2 + 16x = -62$

We now have to add $(\frac{b}{2})^2$ to both sides of the equation. b is 16, so this value becomes $(16\div2)^2 = 8^2 = 64$ .

$x^2 + 16x + 64 = -62+64$

We can now write the left side of the equation as a perfect square. We know that x+8 will be the solution because $8\cdot8=64$ and $8+8=16$ .

$(x+8)^2 = -62 + 64$

We can now take the square root of both sides.

$x+8 = \sqrt{-62+64}\\\\ x+8 = \pm \sqrt{2}$

We can now isolate x on one side by subtracting 8 from both sides.

$x = \pm\sqrt{2} - 8$

So our solutions are

$x = \sqrt{2} - 8\\x = -\sqrt{2} - 8$

Hope this helped!

4 0

2 years ago

If y=kx, where k is a constant, and y=24 when x=6, what is the value of y when x=5

Phoenix [80]

I hope this helps 24 = k * 6 4 = k y = kx y = 4x y = 4 * 5 y = 20

6 0

3 years ago

Sam has two coupons for a bicycle. coupon A: $20 rebate on a $95 bicycle. coupon B: 25% off a $95 bicycle. choose the coupon tha

ANTONII [103]

Answer:

Step-by-step explanation:

5 0

2 years ago