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lana [24]
3 years ago
15

What’s the answer? A B C or D

Mathematics
1 answer:
Lorico [155]3 years ago
8 0

The answer is B: 16.9!

Hope this helps!

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If the sum of a number and eight is doubled, the result is three less than the number. Find the number.
nydimaria [60]

Answer:

n = -19

Step-by-step explanation:

2(n+8) = n - 3

2n + 16 = n - 3

2n = n - 19

n = - 19

8 0
2 years ago
Find three consecutive integers such that the sum of the 1st and 3rd is 60.
bija089 [108]
29,30,31 are the numbers
5 0
3 years ago
The age of some lecturers are 42,54,50,54,50,42,46,46,48 and 48 calculate the mean age and standard deviation
rjkz [21]

Answer:

Mean age: 48

Standard deviation: 4

Step-by-step explanation:

a) Mean

The formula for Mean = Sum of terms/ Number of terms

Number of terms

= 42 + 54 + 50 + 54 + 50 + 42 + 46 + 46 + 48+ 48/ 10

= 480/10

= 48

The mean age is 48

b) Standard deviation

The formula for Standard deviation =

√(x - Mean)²/n

Where n = number of terms

Standard deviation =

√[(42 - 48)² + (54 - 48)² + (50 - 48)² +(54 - 48)² + (50 - 48)² +(42 - 48)² + (46 - 48)² + (46 - 48)² + (48 - 48)² + (48 - 48)² / 10]

= √-6² + 6² + 2² + 6² + 2² + -6² + -2² + -2² + 0² + 0²/10

=√36 + 36 + 4 + 36 + 4 + 36 + 4 + 4 + 0 + 0/ 10

=√160/10

= √16

= 4

The standard deviation of the ages is 4

3 0
3 years ago
Is 27 prime or composite?
marysya [2.9K]

Answer: It is not prime , therefor it's composite.

Step-by-step explanation:

Because....

The number 27 can be evenly divided by 1, 3, 9 and 27, with no remainder.

* Hopefully this helps:) Mark me the brainliest:)!!!

3 0
3 years ago
Read 2 more answers
A rock is dropped from the top of a 2000-foot building. After 1 second, the rock is traveling 32 feet per second. After 2 second
alexandr402 [8]

Using the pairs (1,32) and (2,64) the rate of speed is (64-32 / 2-1 = 32 feet per second.

To find the rate of decent you would multiply the rate by time:

The equation is y = 32x

B. Replace x with 15 and solve for y:

Y = 32(15)

Y = 480

The rate of speed is 480 feet per second.

8 0
2 years ago
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