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4 years ago

Can you use addition to solve a multiplication problem? Yes or no? Explain why or why not

Mathematics

2 answers:

Pepsi [2]4 years ago

7 0

Yes, you can use addition for multiplication and this is the example:

4x3=12

4+4+4=12

All you have is add the first number as many times as it says the second number and then you get the same answer for both equations.

satela [25.4K]4 years ago

5 0

Answer:

it depends on the multiplication problem

Step-by-step explanation:

because u have to add in some and others you dont.

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If a watch has a 0.12 defect rate. what is the probability that the watch has fewer than 3 defects in a run of 75 chimes?

Maslowich

Answer:

$(\frac{88}{100})^{75} + \binom{75}{1} (\frac{88}{100})^{74}(\frac{12}{100}) + \binom{75}{2} (\frac{88}{100})^{73}(\frac{12}{100})^{2}$

Step-by-step explanation:

If a watch has fewer than three defects, then either 1.) It has no defects, 2.) it has exactly 1 defect, or 3.) it has exactly 2 defects.

1.) The probability that the watch has no defects is $(\frac{88}{100})^{75}$ , because for every chime there is a probability of $\frac{88}{100}$ that there is no defect

2.) The probability that the watch has exactly 1 defect is $(\frac{88}{100})^{74}(\frac{12}{100})$ times the number of ways you can choose 1 of 75 of the chimes to be defective, which is $\binom{75}{1}$ , so the probability that the watch has exactly 1 defect is $\binom{75}{1} (\frac{88}{100})^{74}(\frac{12}{100})$ .

3.) For the same reason as 2.), the probability that the watch has exactly two defects is $\binom{75}{2} (\frac{88}{100})^{73}(\frac{12}{100})^{2}$

Since 1.), 2.), and 3.) are mutually exclusive events, the probability of their union is simply the probability of each of them added together, which is $(\frac{88}{100})^{75} + \binom{75}{1} (\frac{88}{100})^{74}(\frac{12}{100}) + \binom{75}{2} (\frac{88}{100})^{73}(\frac{12}{100})^{2}$

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3 years ago

The points (-1,r) and (15,1)lie on a line with slope 1/2. Find the missing coordinate r.

maria [59]

Slope is the change in y over the change in x:

Slope = (y2 - y1) / (x2-x1)

Replace the letters in the equation with the given information:

1/2 = (1 - -1) / (15 -r)

Cross multiply:

1 * (15-r) = 2 * (1- -1)

Simplify:

15 -r = 4

Subtract 15 from each side:

-r = -11

Because r is negative, you need to multiply both sides by -1 to make r positive:

r = 11

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3 years ago

An object is launched from 180 feet above the ground. The function that models the height, in feet, of the object after t second

Ahat [919]

I believe the answer is D

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3 years ago

Choose the correct simplification of the expression a^12b^8/a^2 b^4.

inysia [295]

$\bf ~~~~~~~~~~~~\textit{negative exponents}
\\\\
a^{-n} \implies \cfrac{1}{a^n}
\qquad \qquad
\cfrac{1}{a^n}\implies a^{-n}
\qquad \qquad 
a^n\implies \cfrac{1}{a^{-n}}
\\\\
-------------------------------\\\\
\cfrac{a^{12}b^8}{a^2b^4}\implies a^{12}a^{-2}b^8b^{-4}\implies a^{12-2}b^{8-4}\implies a^{10}b^4$