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3 years ago

Explain why -10 x -10 is 100

Mathematics

2 answers:

Nana76 [90]3 years ago

8 0

Step-by-step explanation:

To multiply a number by 100, move all of its digits two places to the left. Multiplying a whole number by 100 is the same as adding two zero digits to the end of the number. To multiply a number by 100, all digits of this number move two place value columns to the left

tangare [24]3 years ago

7 0

Answer:

-10 x -10 is 100

Step-by-step explanation:

Even though both numbers are negative, the rule when multiplying negative numbers is that if you multiply 2 negative numbers, you would get a positive.

<em>-kiniwih426</em>

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If Chris has 2 times as many nickels as quarters and they have a combined value of 210 cents, how many of each coin does he have

BlackZzzverrR [31]

Im pretty sure she has 6 quarters and 12 nickels since it it twice as much.

$0.25 x 6 =150

$0.5 x 12 =60

total = 210

8 0

3 years ago

69/14 as a mixed number

Otrada [13]

Answer:

6914 is 4 with a remainder of 13

Step-by-step explanation:

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3 years ago

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There are 4 people at a party. Consider the random variable X=’number of people having the same birthday ’ (match only month, N=

yulyashka [42]

Answer:

S = {0,2,3,4}

P(X=0) = 0.573 , P(X=2) = 0.401 , P(x=3) = 0.025, P(X=4) = 0.001

Mean = 0.879

Standard Deviation = 1.033

Step-by-step explanation:

Let the number of people having same birth month be = x

The number of ways of distributing the birthdays of the 4 men = (12*12*12*12)

The number of ways of distributing their birthdays = 12⁴

The sample space, S = { 0,2,3,4} (since 1 person cannot share birthday with himself)

P(X = 0) = $\frac{12P4}{12^{4} }$

P(X=0) = 0.573

P(X=2) = P(2 months are common) P(1 month is common, 1 month is not common)

P(X=2) = $\frac{3C2 * 12P2}{12^{4} } + \frac{4C2 * 12P3}{12^{4} }$

P(X=2) = 0.401

P(X=3) = $\frac{4C3 * 12P2}{12^{4} }$

P(x=3) = 0.025

P(X=4) = $\frac{12}{12^{4} }$

P(X=4) = 0.001

Mean, $\mu = \sum xP(x)$

$\mu = (0*0.573) + (2*0.401) + (3*0.025) + (4*0.001)\\\mu = 0.879$

Standard deviation, $SD = \sqrt{\sum x^{2} P(x) - \mu^{2}} \\SD =\sqrt{ [ (0^{2} * 0.573) + (2^{2} * 0.401) + (3^{2} * 0.025) + (4^{2} * 0.001)] - 0.879^{2}}$

SD = 1.033

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4 years ago

Paul can walk 15 steps in 5 minutes. How long does it take Paul to walk 75 steps at the same speed? I got 25 minutes am i right?

lina2011 [118]

The best way to solve this one is with a proportion:

(15 steps) / (5 minutes) = (75 steps) / ('x' minutes)

Cross-multiply the proportion: 15 x = 5 x 75

Divide each side by 15 : x = 5 x 5 = <em>25 minutes</em>.

You are correct, and Paul walks very slowly.

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3 years ago

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The points plotted below satisfy a polynomial equation. What type of extreme value does the graph have in the part that is visib

bezimeni [28]

Hi!

The graph shows an A) Maximum

A Maximum value appears in a graph when all other values of the polynomial are smaller in value i.e. are under it in an X-Y plot. This is expressed mathematically as:

There is a maximum if for a given x*: f(x*) ≥ f(x) for all x.

In the graph, you can clearly see that there is a value that is higher than all the others, so this value is a Maximum.

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3 years ago