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gladu [14]
2 years ago
5

Simplify 6(x + 3). 6x + 3 x + 18 6x + 18 6x + 9

Mathematics
1 answer:
Kisachek [45]2 years ago
7 0

Answer:

the answer of this question is = 6x + 18

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3x -4y= -20 -x +2y =10 whats the value of y
Anni [7]
3x-4y=10
-20-x+2y=10 then -30+2y=x now plug this in the other equation:
3(-30+2y)-4y=10
-90+6y-4y=10
2y=100
y=50
4 0
2 years ago
The average marks of the first 10 students are 17 and that of the next 15 students is 18. find the mean of 25 students?
Ray Of Light [21]

Answer:

The mean of 25 students is 17.6

Step-by-step explanation:

The formula of the mean (average) is mean (average) = \frac{S}{N} , where S is the sum of the data, and N is the number of the data

∵ The average marks of the first 10 students are 17

- That means the mean is 17 and the number of students is 10

∴ Average = 17

∴ N = 10

∵ Average = \frac{S}{N}

- Substitute average by 17 and N by 10

∴ 17 = \frac{S}{10}

- Multiply both sides by 10

∴ 170 = S

∴ The sum of the marks of the first 10 students is 170

∵ The average of the next 15 students is 18

∴ Average = 18

∴ N = 15

- Substitute average by 18 and N by 15

∴ 18 = \frac{S}{15}

- Multiply both sides by 15

∴ 270 = S

∴ The sum of the marks of the next 15 students is 270

Now to find the mean of 25 students and the two sums and divide the answer by 25

∵ S = 170 + 270

∴ S = 440

∵ N = 25

∴ Mean = \frac{440}{25}

∴ Mean = 17.6

The mean of 25 students is 17.6

3 0
3 years ago
PLEASE HELP ME~!!!!!!!
MAXImum [283]

Answer: y= 5x + 3

Step-by-step explanation:

Lol literally so easy when you understand it so:

the formula for slope intercept form is:

y= mx + b

in this case just plug in the values

hope this helps ;)

also can I get brainliest pls?

7 0
2 years ago
Flying against the jetstream, a jet travels 7380 miles in 9 hours. Flying with the jetstream, the same jet travels 9920 miles in
Damm [24]

Answer:

The rate of the jet in still air = 1030 miles per hour

And 210 miles per hour is the rate of the stream.

Step-by-step explanation:

Let the speed of the jet in still air be x miles per hour.

And,the speed of the jetstream be y miles per hour.

Key:So when it is moving against the stream speed will be (x-y) and when it is moving with the stream, speed will be (x+y)

And we know that.

Distance=Speed multiplied with time.

Arranging the equation.

9920=8 \times (x+y)...equation 1

7380=9 \times (x-y)...equation 2

Working with the equation by using elimination method.

Dividing equation 1 with 8 and equation 2 with 9.We will have

1240=(x+y)...eqn 3

820=(x-y)...eqn 4

Now adding both the equation will decimate y.

1240+820=2x

2060=2x

Dividing with 2 both sides.

1030=x

By plugging the value of x we can find y in equation 3.

1240=1030 + y

Subtracting 1030 from both sides.

1240-1030=y

y =210 miles per hour

So the rate of the jet in still air = 1030 miles per hour

And 210 miles per hour is the rate of the jet stream.

6 0
3 years ago
Look at the numbers below. 7, 10, 13, 14 Which pair of numbers has an odd product and an even sum? 7 and 10 7 and 13 10 and 13 1
Ad libitum [116K]
Your answer is 725 hope this helps 
4 0
3 years ago
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