All categories

3 years ago

What multiplication tables should every student memorize.

Mathematics

1 answer:

german3 years ago

4 0

Answer:

1-15

Step-by-step explanation:

You should at least teach students 1-15 or 1-20

You might be interested in

A triangle has side lengths of 77 centimeters, 55 centimeters, and cc centimeters. enter a value to complete the inequality that

PtichkaEL [24]

The correct question is
A triangle has side lengths of 7 centimeters, 5 centimeters, and c centimeters. enter a value to complete the inequality that describes the possible values for c, the length of the third side of the triangle.

we know that
The sum of the lengths of any two sides of a triangle must be greater than the third side

If c is the smallest number, then

5 + c > 7
c > 2

If c is the largest number, then

5+7 > c
12 > c----------> c < 12

the answer is
The value of c must be in the interval (2,12)

3 0

3 years ago

I’m stuck in this question

Korolek [52]

X = 47

because
100-6= 94
94 divided by 2 = 47

4 0

3 years ago

Read 2 more answers

The heights of adult men in America are normally distributed, with a mean of 69.8 inches and a standard deviation of 2.69 inches

Brilliant_brown [7]

Answer:

a) 1.93

b) 97.32% of men are SHORTER than 6 feet 3 inches

c) 2.71

d) 0.34% of women are TALLER than 5 feet 11 inches

Step-by-step explanation:

When the distribution is normal, we use the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore 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 pvalue, we get the probability that the value of the measure is greater than X.

a. If a man is 6 feet 3 inches tall, what is his z-score (to two decimal places)?

For man, $\mu = 69.8, \sigma = 2.69$

A feet has 12 inches, so this is Z when X = 6*12 + 3 = 75. So

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

$Z = \frac{75 - 69.8}{2.69}$

$Z = 1.93$

b. What percentage of men are SHORTER than 6 feet 3 inches?

Z = 1.93 has a pvalue of 0.9732

97.32% of men are SHORTER than 6 feet 3 inches

c. If a woman is 5 feet 11 inches tall, what is her z-score (to two decimal places)?

For woman, $\mu = 64.1, \sigma = 2.55$

Here we have X = 5*12 + 11 = 71.

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

$Z = \frac{71 - 64.1}{2.55}$

$Z = 2.71$

d. What percentage of women are TALLER than 5 feet 11 inches?

Z = 2.71 has a pvalue of 0.9966

1 - 0.9966 = 0.0034

0.34% of women are TALLER than 5 feet 11 inches

5 0

4 years ago

A coin is flipped 70 times and lands on tails 28 times. What is the relative frequency of the coin landing on tails? 20% 30% 40%

ivanzaharov [21]

The relative percentage is the ratio of a certain outcome compared to the total. In this case the outcome is tails and there were 28 of those. To calculate the percentage you must take the outcome and divide it by the total. If you divide 28 by 70 you get 0.4 meaning the frequency is 40%

3 0

3 years ago

Read 2 more answers

If a string is 38 millimeters long, how many meters long is it? (1 millimeter = 0.001 meter)

Basile [38]

38 mm to m

38 mm * (0.001 m / 1 mm)
**cancel mm units**
38 * (0.001 m / 1)
0.038 m

you're correct

8 0

3 years ago

Read 2 more answers