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Liono4ka [1.6K]
3 years ago
8

the sum of two numbers is 54. if the greatest number is reduced by 20 and the lesser number tripled the difference of the two wo

uld be six. what's the product of the two number

Mathematics
1 answer:
elena-s [515]3 years ago
4 0

Answer:

504

Step-by-step explanation:

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Rudik [331]
The equation that can not be represented is B because the variables are mixed up and are not matching with the correct formula.
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The area of the base (B) of a triangular pyramid is 28 cm. The perimeter (p) is 20 cm, and the slant height (S) is 5 cm. Determi
kenny6666 [7]

Answer:

The pyramid's surface area is 78 square centimeters

Step-by-step explanation:

The formula of the surface area of a pyramid is S.A = A + \frac{1}{2} p s, where

  • A is the area of its base
  • p is the perimeter of its base
  • s is the slant height of it

∵ The area of the base of a triangular pyramid is 28 cm²

∴ A = 28 cm²

∵ The perimeter of the base is 20 cm

∴ p = 20 cm

∵ The he slant height is 5 cm

∴ s = 5 cm

- Substitute these values in the formula of the surface area

   above to find it

∵ S.A = 28 + \frac{1}{2} (20)(5)

∴ S.A = 28 + 50

∴ S.A = 78 cm²

The pyramid's surface area is 78 square centimeters

5 0
3 years ago
Determine whether the pair of equations is
ASHA 777 [7]

Answer:

The answer is neither.

Step-by-step explanation:

We need to solve for y in the equation, 10x-2y= 6.

In other words, we are going to find the slope intercept of that equation.

10x - 2y = 6 \\  \frac{ + 10x =  + 10x}{ - 2y = 10x + 6}  \\  \\  \frac{ - 2y }{ - 2}  =  \frac{10x + 6}{ - 2}  \\ y =  - 5x  - 3

So we have now have both the equations:

y = 5x + 2 \\ and \\ y =  - 5x - 3

It's not parallel because the slopes aren't the same. It's not perpendicular because when the slope of the equation becomes a negative reciprocal, it still doesn't end up with the same slope as the other equation.

It's neither parallel or perpendicular.

8 0
3 years ago
Find the area of a circle with diameter, <br> d<br> = 6.2m.<br> Give your answer rounded to 1 DP.
astraxan [27]

Answer:

3.14(3.1)^2 = 30.1754

Step-by-step explanation:

pi times radius squared - area of a circle

3 0
2 years ago
Annual income: The mean annual income for people in a certain city (in thousands of dollars) is 41, with a standard deviation of
USPshnik [31]

Answer:

By the Central Limit Theorem, the distribution of the sample means is approximately normal with mean 41 and standard deviation 2.92, in thousands of dollars.

Step-by-step explanation:

Central Limit Theorem

The Central Limit Theorem establishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}.

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

Mean of 41, standard deviation of 28:

This means that \mu = 41, \sigma = 28

Sample of 92:

This means that n = 92, s = \frac{28}{\sqrt{92}} = 2.92

Distribution of the sample means:

By the Central Limit Theorem, the distribution of the sample means is approximately normal with mean 41 and standard deviation 2.92, in thousands of dollars.

4 0
2 years ago
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