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3 years ago

1. Sоlvе х^2 = -169.

Mathematics

1 answer:

lys-0071 [83]3 years ago

7 0

Answer:

x=13i, -13i

Step-by-step explanation:

Take the square root of both sides which gives you plus or minus the square root of -169. Then you get plus or minus 13times the square root of negative 1. Now you can say that x equals positive or negative 13i

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No link answers please!!

nignag [31]

Answer: X= 6 or X=-4

Step-by-step explanation:

$x^{2} -2x-24=0\\(x-6)(x+4)=0\\x-6=0 --> x=6\\x+4=---> x=-4$

8 0

3 years ago

A large water tank holds 210 liters of water. About how many gallons of water does the same tank hold, if there are approximatel

shusha [124]

Answer:

Step-by-step explanation:

Set up a proportion

15 Liters / 4 gallons = 210 Liters / x Cross Multiply

15x = 4 * 210 Combine the right

15x = 840 Divide by 15

x = 840 / 15

x = 56 gallons

4 0

3 years ago

Which ordered pair in the form (x, y) is a solution of this equation?

laiz [17]

Answer:

Substitute the x and y values from the ordered pairs into the equation, one by one, until both sides of the equation are equal.

Step-by-step explanation:

A. (-2,-3)

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

-6 + 12 = 21

6 = 21 not equal

B. (0,7)

3 * 0 - 4 * 7 = 21

0 - 28 = 21

- 28 = 21 not equal

C. (7,0)

3 * 7 - 4 * 0 = 21

21 - 0 = 21

21 = 21 equal

6 0

2 years ago

How to solve (2x+8)^2

dusya [7]

You have to foil out the problem
(2x+8)(2x+8)
4x^2+16x+16x+64
4x^2+32x+64

4 0

3 years ago

Please help! I need the surface area for both. Absurd answer are not tolerated. Thanks if you help!

Natasha_Volkova [10]

Answer:

<h3>Figure 1</h3>

Perimeter of base = 5 + 5 + 8 = 18 ft

Height = 7 ft

Base area = 1/2(8)(3) = 12 ft²

Surface area:

S = 18*7 + 2*12 = 150 ft²

<h3>Figure 2</h3>

Surface area of cube:

S = 6a² = 6(2.5)² = 37.5 m²

Surface area of prism:

S = 2(11 + 9)(7) = 280 m²

Overlapping area:

S = 2.5² = 6.25 m²

Surface area of composite figure:

S = 280 + 37.5 - 2(6.25) = 305 m²

4 0

3 years ago