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3 years ago

Finds the solutions to x^2=20

Mathematics

1 answer:

ELEN [110]3 years ago

6 0

Answer:

the solution of:

x²=20

√x² = √(2² × 5)

x=2√5

So the answer is

A. x= ±2√5

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Question Progress

kozerog [31]

5 - 2 times 38 is -71.
Have a nice day

7 0

4 years ago

Read 2 more answers

Monica earned $60 from a bonus plus $8.50 per hour (h) she worked this week. Which of the following expressions best represents

stira [4]

Answer:

8.50+60=110 because u can't calculate the h it has been represented by 50 or 60

7 0

3 years ago

Read 2 more answers

This is Algebra 2. help me

gladu [14]

(4x^2-25)/(2x-5)=14
we hates fractions so m ultiply both sides by (2x-5)
4x^2-25=14(2x-5)
4x^2-25=28x-70
add 70 to both sides
4x^2+45=28x
subtract 28x fromoth sides
4x^2-28x+45=0
use quadratic formula which is
if you have
ax^2+bx+c=0 then
x= $\frac{-b+/- \sqrt{b^{2}-4ac} }{2a} 
$
a=4
b=-28
c=45
subsitute
x= $\frac{-(-28)+/- \sqrt{(-28)^{2}-4(4)(45)} }{2(4)} 
$
x= $\frac{28+/- \sqrt{784-720} }{8} 
$
x= $\frac{28+/- 8}{8} 
$
x= $\frac{5}{2} 
$ or $\frac{9}{2} 
$
if we were to put 5/2 for x, the deonomentor would be equal to zero, so it cannot be used

answer is
x=9/2

3 0

3 years ago

An economist wants to estimate the mean per capita income (in thousands of dollars) for a major city in Texas. He believes that

tankabanditka [31]

Answer:

1442

Step-by-step explanation:

Given,

Mean is,

$\mu = 20.4$

Standard deviation,

$\sigma = 8.8$ ,

Margin of error(E) = 0.54,

For 98% level of confidence, $z_{\frac{\alpha}{2}} = 2.33$

Thus, the sample size would be,

$n=[\frac{z_{\frac{\alpha}{2}}\times \sigma}{E}]^2$

$=[\frac{2.33\times 8.8}{0.54}]^2$

$=1441.74902606$

$\approx 1442$

6 0

3 years ago

Ubtract 2Five-sixths – 1One-third.

gayaneshka [121]

Answer:

Step-by-step explanation:

Please type numerals and punctuation for your mixed numbers.

I will have to assume that you meant 2 5/6 and 1 1/3, and that you are subtracting 2 5/6 from - 1 1/3. If that is correct, then we determine the LCD and rewrite -1 1/3 using this LCD:

-1 1/3 -1 2/6

-2 5/6 -2 5/6

----------

-3 7/6 or -4 1/6

The best calculation of this difference is -4 1/6 and the best estimate is

-1 - 3, or -4

5 0

3 years ago