All categories

2 years ago

Find the solutions to x² = 20.

Mathematics

1 answer:

snow_tiger [21]2 years ago

7 0

Answer:

$x = \pm2 \sqrt 5$

Step-by-step explanation:

$~~~~~~x^2=20\\\\\implies x = \pm\sqrt{20}\\\\\implies x = \pm \sqrt{ 4 \times 5}\\\\\implies x = \pm2 \sqrt 5$

You might be interested in

TIMEDD EASY PLS HELP NO LINKS

melamori03 [73]

1/3 πr^2h
1/3 π2
2/3 π
answer : A
good luck

7 0

3 years ago

Phil's height is 51.2 cm, suzanne's height is 5'4", and suzanne's shadow lengthat gobblers knob is 76.2

8090 [49]

Answer:

$P_1 = 24cm$

Step-by-step explanation:

Represent:

Phil's height with P

Suzanne's height with S

Phil's shadow with P1

Suzanne's shadow with S1

So, we have:

$P = 51.2cm$

$S = 5'4"$

$S_1 = 76.2cm$

Required

Calculate the length of Phil's shadow --- Missing part of question

To do this, we make use of the following equivalent ratio.

$P:S = P_1 : S_1$

Convert $S = 5'4"$ to cm

$S = 5ft\ 4in$

$S = (5*30.48+ 4*2.54)cm$

$S = 162.56cm$

Substitute values for P, S and S1

$51.2cm : 162.56cm = P_1 : 76.2cm$

Express as fraction

$\frac{51.2cm}{162.56cm} = \frac{P_1 }{ 76.2cm}$

Make P1 the subject

$P_1 = 76.2cm * \frac{51.2cm}{162.56cm}$

$P_1 = 76.2cm * \frac{51.2}{162.56}$

$P_1 = \frac{76.2cm * 51.2}{162.56}$

$P_1 = \frac{3901.44cm}{162.56}$

$P_1 = 24cm$

<em>Hence, the length of Phil's shadow is 24 cm</em>

6 0

2 years ago

If you draw a card with a value of two or less from a standard deck of cards, i will pay you $407$⁢407. if not, you pay me $31$⁢

sladkih [1.3K]

You should ask your parent/guardian or teacher if needed! Merry Christmas!

7 0

3 years ago

How do i solve this using matrices not systems of equations

nikklg [1K]

The answer of the matrix equation will be $\left[\begin{array}{ccc}-2\\3\end{array}\right]$

<h3>What is Matrix ?</h3>

Matrices are known as the tables of numbers. The numbers are usually put into the big brackets. Matrices are given the 'orders', which describes the size of the matrices. The order is the number of rows 'by' the number of columns. For example: a 2 by 3 matrix has 2 rows and 3 columns.

Step-by-step explanation:

1.Find the inverse matrix of the equation

$\left[\begin{array}{ccc}2&1\\1&2\end{array}\right]$