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3 years ago

What is the lcm of 3,9, and 15?

2 answers:

7 0

The LCM of any set of numbers that has a prime or a number of primes in common. The way to find it is to factor the given number down to it's primes.

3: 3

9: 3 * 3

15: 3 * 5

The number which has been bolded is the LCM in this case 3 <<<< Answer

This is not a particularly good question to learn what it might be Try these 3 numbers.

42: 2*3 * 7

84: 2 * 2 * 3 * 7

210: 2*5 * 3 * 7

The LCM for this bunch is 2 * 3 * 7 = 42

s344n2d4d5 [400]3 years ago

3 0

The least common multiple that is common in all numbers but is the lowest is 3 and it's the only number that all numbers listed can be divided easily by.

Hope this helps!

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Carla's retirement party will cost $15 if she invites 3 guests. If there are 4 guests, how much will Carla's retirement party co

LekaFEV [45]

Answer:

$20

Step-by-step explanation:

15/3=5 which means that for every guest attending Carla's retirement party it must cost her $5 each.

Therefore if 4 guests come to the party it must mean 4(5) which is 20.

Hence $20

7 0

3 years ago

Read 2 more answers

Each of students reported the number of movies they saw in the past year. Here is what they reported. 6, 13, 13, 19, 16, 4, 5 Fi

Artemon [7]

Answer:10.9

Step-by-step explanation:You add all of the numbers together (76) and then divide by the total of numbers (7). You will get 10.85714286, you have to round to the nearest 10th , so the 5 changes the 8 to a 9.

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3 years ago

Factorize:<br> 2ax-6ay+bx-3by

Elodia [21]

Answer:

2ax − 6ay + bx − 3

Step-by-step explanation:

The expression is not factorable with rational numbers

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3 years ago

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Suppose the mean SAT verbal score is 525 with a standard deviation of 100, while the mean SAT math score is 575 with a standard

Ipatiy [6.2K]

Answer:

The mean of the combined math and verbal scores is 1100, while the standard deviation is 141.

Step-by-step explanation:

Normal variables

Normal variables have mean $\mu$ and standard deviation $\sigma$

When we add normal variables, the combined mean is the sum of both means, and the standard deviation is the square root of the sum of both variances. The distribution is still normal.

In this question:

Verbal: $\mu_{V} = 525, \sigma_{V} = 100$ .

Math: $\mu_{M} = 575, \sigma_{M} = 100$

Combined:

$\mu = \mu_{V} + \mu_{M} = 525 + 575 = 1100$

$\sigma = \sqrt{\sigma_{V}^{2}+\sigma_{M}^{2}} = \sqrt{100^2 + 100^2} = 141$

The mean of the combined math and verbal scores is 1100, while the standard deviation is 141.

6 0

3 years ago

Pleaseeeeee help !!

umka21 [38]

$A.\\-vp+40 < 95\qquad\text{subtract 40 from both sides}\\\\-vp < 55\qquad\text{change the signs}\\\\vp > -55\qquad\text{divide both sides by p}\\\\If\ p > 0\ then\ v>-\dfrac{55}{p}.\\\\If\ p < 0\ then\ v < -\dfrac{55}{p}$

$B>\\8w-3r=45\qquad\text{subtract 8 from both sides}\\\\-3r=-8w+45\qquad\text{change the signs}\\\\3r=8w-45\qquad\text{divie both sides by 3}\\\\r=\dfrac{8w-45}{3}$

4 0

3 years ago