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3 years ago

How do you know what to round a number by when it doesn't say it

Mathematics

1 answer:

Dmitrij [34]3 years ago

4 0

Answer:

Most of the time if it doesn't say our should round up it's best to leave the number as it is.However in some situations this isn't possible.For instance if there are to be a recurring decimal like 47.47485... it would be best to round to the nearest to decimal places so-47.47 unless told otherwise.

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Please help ! I need the answers for #43 and #44

Vlad [161]

43. 9 + 10 + 13 + 13 = $45

45 - 1 = 44

44 x 4 = 176

176 + 8 = 184

184/4 = 46

46 tokens per person

44. a. 22 x 5 = 110

943/110 = 8.7

you will need 9 bookcases

b. 110 x 9 = 990

990 - 943 = 47

47 - 44 = 3

There will be 3 books on the third shelf.

4 0

3 years ago

The sum of two numbers is 27. One of the numbers is three more than the other. Find the numbers,

bonufazy [111]

Answer:

12 and 15

Step-by-step explanation:

x + y = 27

x +3 = y

x = y - 3

y - 3 + y = 27

2y = 24

y = 12

7 0

2 years ago

Supply and demand coordinate to determine prices by working

Verdich [7]

The Answer is Together

4 0

3 years ago

Which pair of segments in the figures below are congruent?

MrRissso [65]

Answer:

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4 0

3 years ago

Solve 3x2 = −12x − 15. x = −4 ± 2i x = −4 ± i x = −2 ± 2i x = −2 ± i

diamong [38]

ANSWER

$x = - 2 \pm i$

EXPLANATION

We use the method of completing the squares.

The equation is
$3 {x}^{2} = - 12x - 15$

We rewrite the above equation to obtain;

$3 {x}^{2} + 12x = - 15$

We divide through by 3 to obtain;

${x}^{2} + 4x = - 5$

We add half the coefficient of
$x$

to both sides of the equation to get,

${x}^{2} + 4x + {2}^{2} = - 5 + {2}^{2}$

The right hand side is now a perfect square.

${(x + 2)}^{2} = - 1$

We now take square root of both sides to get;

$x + 2 = \pm \sqrt{ - 1}$

We add -2 to both sides,

$x = - 2 \pm \sqrt{ - 1}$

We simplify to obtain,

$x = - 2 \pm i$

3 0

3 years ago