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3 years ago

Write a description of how a diagram can help you solve 2×40

Mathematics

2 answers:

olya-2409 [2.1K]3 years ago

8 0

Draw 40 boxes, and in a separate section draw another 40 boxes.
(If you have the time :) )

Viefleur [7K]3 years ago

7 0

A diagram can help you by just draw 80 boxes.

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SOMEONE PLEASE HELP ME

slava [35]

Smart Dot, multiply the cost per hour by number of hours (t) and add to the monthly fee:

C = 0.50t + 12

Communication plus: Multiply the cost per hour by number of hours (t)

C = 2.50t

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3 years ago

Keenan scored 80 points on an exam that had a mean score of 77 points and a standard deviation of 4.9 points. Rachel scored 78 p

Artemon [7]

Answer:

Keenan's z-score was of 0.61.

Rachel's z-score was of 0.81.

Step-by-step explanation:

Z-score:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the z-score of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

Keenan scored 80 points on an exam that had a mean score of 77 points and a standard deviation of 4.9 points.

This means that $X = 80, \mu = 77, \sigma = 4.9$

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{80 - 77}{4.9}$

$Z = 0.61$

Keenan's z-score was of 0.61.

Rachel scored 78 points on an exam that had a mean score of 75 points and a standard deviation of 3.7 points.

This means that $X = 78, \mu = 75, \sigma = 3.7$ . So

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{75 - 78}{3.7}$

$Z = 0.81$

Rachel's z-score was of 0.81.

6 0

2 years ago

The initial price for wingstop is $40. After using a 30% discount, what is the<br> new cost?

Natali [406]

Answer:

$28 dollars is the new cost

Step-by-step explanation:

$40 - 30% = $28

6 0

3 years ago

1 3/4 x 1 1/3 give your answer as a mixed number

WARRIOR [948]

Answer:

2 1/3

Step-by-step explanation:

1 3/4 is equivalent to 7/4

1 1/3 is equivalent to 4/3

7/ 4 x 4/3

reduce with greatest common factor so the two 4 are out (show a line crossing out the top and bottom 4 )

now you're left with 7 x 1/3 = 7/3

7/3 = 2 1/3

4 0

2 years ago

Read 2 more answers

What is the value of x?<br> Enter<br> your answer in the box.<br> X=

Naddika [18.5K]

The letter "x" is often used in algebra to mean a value that is not yet known. It is called a "variable" or sometimes an "unknown". In x + 2 = 7, x is a variable, but we can work out its value if we try!

8 0

3 years ago