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cluponka [151]
3 years ago
5

Help 39 point pic below Math

Mathematics
1 answer:
Kruka [31]3 years ago
8 0

Step-by-step explanation:

Remember the Difference of Squares:

a² - b² = (a + b)(a - b)

Therefore (√20 - √3)(√20 + √3)

= (√20)² - (√3)² = 20 - 3 = 17. (C)

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Please help me urgently! 50 points giving brainliest.
fgiga [73]

The number of significant figures in the numbers are

  • 100 cm = 1 significant digit
  • 0.006700 cm = 2 significant digits
  • 450. cm = 3 significant digits

<h3>How to determine the number of significant figures in the following numbers?</h3>

As a general rule, the zeros before and after the non-zero figures are not significant.

Using the above rule, we have:

  • 100 cm = 1 significant digit
  • 0.006700 cm = 2 significant digits
  • 450. cm = 3 significant digits

<h3>How to round the following numbers to the correct number of significant figures</h3>

Using the above rule in (a), we have:

  • 123g to show 1 sig fig = 100 g
  • 0.19851m to show 2 sig figs = 0.2 m
  • 0.0057034L to show 3 sig figs = 0.005703 L

<h3>How to report the following answers with correct significant figures</h3>

We have:

(12.93cm) x (2.34cm) x (8cm) = 242.05 cm^3 because 12.93 has 4 significant figures

67.0m / 2.18s = 30.7 m/s because 2.18 has 3 significant figures

<h3>How to convert the following metric to metric</h3>

450mL = 0.45 L

because 1 mL = 0.001 L

2.3 dm = 0.00023 km

because 1 dm = 0.0001 km

0.120cg = 1.2 mg

because 1 cg = 10 mg

6700L = 670000 cL

because 1 L = 100 cL

<h3>How to convert the following metric</h3>

a. 2.34miles = 3.76 km (1mile = 1.61km) -- given

b. 5.3ft = 161.544 cm(2.54cm = 1 in)

Because 1 ft = 30.48 cm

Read more about significant figures at:

brainly.com/question/24491627

#SPJ1

6 0
2 years ago
Prove: The sum of two multiples of 3 is a multiple of 3
andrey2020 [161]

Answer:

  3 . . . goes in both boxes

Step-by-step explanation:

Use the distributive property. Remove the common factor to outside parentheses:

  3(m +n) = a multiple of 3

6 0
3 years ago
The thickness of a protective coating applied to a conductor designed to work in corrosive conditions follows a uniform distribu
pochemuha

Answer:

P(24< X

And replacing we got:

P(24< X

Step-by-step explanation:

We can define the random variable X as the thickness of a protective coating applied to a conductor designed to work in corrosive conditions. And the distribution for X is given by:

X \sim Unif (a = 20, b=40)

And we want to find this probability:

P(24< X

And in order to find this probability we can use the cumulative distribution function given by:

F(x) = \frac{x-a}{b-a} , a\leq X \leq b

And if we use this formula for the probability desired we have:

P(24< X

And replacing we got:

P(24< X

5 0
3 years ago
You buy 3 dinners that are $6.85 each. Before tax and tip, the total is $25.42. Is this total correct? Explain
lana [24]

Answer:

no

Step-by-step explanation:

the total would be $19.55 before tax and tip

6 0
3 years ago
Write the equation of the line with slope 4 through the point (-2, 5)
SSSSS [86.1K]

Answer:

y=4x+13  or y-5=4(x+2)

Step-by-step explanation:

we know that

The equation of the line into point slope form is equal to

y-y1=m(x-x1)

In this problem we have

m=4

(x1,y1)=(-2,5)

substitute

y-5=4(x+2) ----> equation of the line into point slope form

Convert to slope intercept form

y-5=4x+8

y=4x+8+5

y=4x+13 ----> equation of the line into slope intercept form

5 0
3 years ago
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