3 years ago

Substitution method x=2y 2x+5y=4

Mathematics

1 answer:

Dvinal [7]3 years ago

6 0

Answer:

y=4/9

Step-by-step explanation:

Substitute 2y into the x

2(2y)+5y=4

4y+5y=4

9y=4

y=4/9

You might be interested in

Do the right side<br> show work<br> 2,4,6,8,10

Anna71 [15]

Answer:

tjownnjdusisij2nmw9sol3

3 0

3 years ago

For a random sample of 50 measurements on the breaking strength of cotton threads, the mean breaking strength was found to be 21

Vikentia [17]

Answer:

205.81 to 214.19

Step-by-step explanation:

Sample size (n) = 50

Sample mean weight (X) = 210 grams

Sample standard deviation (s) = 18 grams

Confidence coefficient (Z) at 90% = 1.645

The confidence interval for the true mean breaking strength of cotton threads of this type, at a 90% confidence level, is given by:

$CI=X \pm Z*\frac{s}{\sqrt n}\\CI=210 \pm 1.645*\frac{18}{\sqrt 50}\\CI = 210 \pm 4.19\\CI =205.81\ to\ 214.19$

The confidence interval is 205.81 grams to 214.19 grams.

6 0

3 years ago

7 (2.268- 2.036) ? answer I need help

Arisa [49]

The answer to this question is 1.624

3 0

2 years ago

Read 2 more answers

What is the answer to number 7b?

Semmy [17]

Increasing it by 10% will be 11.55. To find teen percent all you do is make it a decimal then multiplying it by 10.50

4 0

3 years ago

Which numbers are solutions to the equation 30=x2

GaryK [48]

Answer:

x = +√30

Step-by-step explanation:

Please write 30 = x squared as 30 = x^2.

If x^2 = 30, there are two solutions: x = +√30 and x = -√30.

Several possible answers are given. x=30−−√ is closest to the correct one, but must be written as x = √30. Please ask someone how to find the "√" operator in Brainly. Or, just write "sqrt( )" instead.

6 0

3 years ago