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Andrew [12]
3 years ago
8

If a and b are any two real numbers, explain how you calculate the difference . Be sure to include each of the following in your

explanation.
(a) A description of the relationship between addition and subtraction
(b) How you can use a number line to help with the calculation
(c) How you can determine the sign of the result
Mathematics
1 answer:
Alchen [17]3 years ago
8 0
Diffference between a and b
a-b

a. addition and subtraction
subtraction is adding, but going backwards in oposite direction

b.  negative, go to left, postive go to right

c. if negative is more than positive, then ending sign is negaitve
if positive is more than negative, then sign is positive
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A plastic box has a length 4 cm longer than its width. The area of the rectangular top of the box is 77 square cm. Find the leng
finlep [7]

Answer: the length is 11 cm.

The width is 7 cm.

Step-by-step explanation:

Let L represent the length of the rectangular plastic box.

Let W represent the width of the rectangular plastic box.

The area of the rectangular top of the box is 77 square cm. This means that

LW = 77- - - - - - - ;- - - -1

The plastic box has a length 4 cm longer than its width. This means that

L = W + 4

Substituting L = W + 4 into equation 1, it becomes

(W + 4)W = 77

W² + 4W = 77

W² + 4W - 77 = 0

W² + 11W - 7W - 77 = 0

W(W + 11) - 7(W + 11) = 0

W - 7 = 0 or W + 11 = 0

W = 7 or W = - 11

Since the width cannot be negative, then W = 7cm

L = 77/7 = 11 cm

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3 years ago
A team of bakers can roll and form 5 dozen pretzels in 9 minutes. How many pretzels can this team form in 1 hour?
tino4ka555 [31]
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8 0
3 years ago
3 in<br> 2.7in<br> 8.65 in<br> cubic inches <br> What’s the volume
jolli1 [7]

Answer:

8.56

Step-by-step explanation:

5 0
3 years ago
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Irina-Kira [14]

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6 0
4 years ago
A standard American Eskimo dog has a mean weight of 30 pounds with a standard deviation of 2 pounds. Assuming the weights of sta
nalin [4]

Answer:

Option 2 - Approximately 24–36 pounds

Step-by-step explanation:

Given : A standard American Eskimo dog has a mean weight of 30 pounds with a standard deviation of 2 pounds. Assuming the weights of standard Eskimo dogs are normally distributed.

To find : What range of weights would 99.7% of the dogs have?

Solution :

The range of 99.7% will lie between the mean ± 3 standard deviations.

We have given,

Mean weight of Eskimo dogs is \mu=30

Standard deviation of Eskimo dogs is \sigma=2

The range of weights would 99.7% of the dogs have,

R=\mu\pm3\sigma

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R=30+6,30-6

R=36,24

Therefore, The range is approximately, 24 - 36 pounds.

So, Option 2 is correct.

5 0
4 years ago
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