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3 years ago

Please help me answer this for my grade !! I will give braisnlt

Mathematics

1 answer:

skelet666 [1.2K]3 years ago

6 0

Step-by-step explanation:

2x+3y=23 2x+3.7=23 2×1 + 3×7 = 23

3y= 23 2×+21= 23 2 + 21 = 23

23÷3 = 7 2x= 23-21

y=7 2x= 2

x= 1

5x+3y=17 5×4+3y=17

5x=17+3 20+3y=17

5×=20 20=17+3y

14÷5 = 4 20=20+y

x=4 y=20-20

y=0

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I need help please. How do I find the value of x?

Zina [86]

X = 58

The angle directly across from the 32 is also 32 degrees because it uses the same lines at the same angles. That's the Vertical Angles Theorem. The line straight across means that is 180 degrees, which is already split in half by the visible 90 degree angle (given by the box in the corner). Since all the angles are on the same side of the line, the 180 degree angle, they should add up to equal 180 degrees. Also, since 90 is half of 180, the 32 degree angle and the x angle should just add up to equal 90 degrees. So, 90 minus 32 equals 58.

7 0

3 years ago

The average cost of living for a family of four in twelve different cities was found to be $65,351 with a standard deviation of

Andrej [43]

Answer:

$65,351+/-$3,661.73

= ( $61,689.27, $69,012.73)

Therefore, the 90% confidence interval (a,b) = ( $61,689.27, $69,012.73)

Step-by-step explanation:

Confidence interval can be defined as a range of values so defined that there is a specified probability that the value of a parameter lies within it.

The confidence interval of a statistical data can be written as.

x+/-zr/√n

Given that;

Mean x = $65,351

Standard deviation r = $7,711

Number of samples n = 12

Confidence interval = 90%

z(at 90% confidence) = 1.645

Substituting the values we have;

$65,351+/-1.645($7,711/√12)

$65,351+/-1.645($2,225.973962860)

$65,351+/-$3661.727168905

$65,351+/-$3,661.73

= ( $61,689.27, $69,012.73)

Therefore, the 90% confidence interval (a,b) = ( $61,689.27, $69,012.73)

6 0

4 years ago

Can someone help me ASAP, please and ty! What is “ 3x^2 added to 6x^2” simplifed to?

mr_godi [17]

Answer 9x^2

Step-by-step explanation:

3x^2+6x^2=9x^2

8 0

3 years ago

Read 2 more answers

Anna bought p packages of paper plates at Party City that cost $4 per package and c packages of cups that cost $3 per package. S

sergeinik [125]

Answer:

$46

Step-by-step explanation:

Cost: 4p + 3c + 16

if p=3 and c=6 then,

4(3) + 3(6) +16

12+18+16

46 dollars spent

4 0

3 years ago

11.Find the missing value given the rate of change.(2,6) and (x, 10) m = 4

Anvisha [2.4K]

The missing value x=3 is obtained by the concept of slope in coordinate geometry.

<h3>What is slope?</h3>

Positive or negative rates of change are both possible. Since the slope of a line is determined by the ratio of the vertical and horizontal change between any two locations on a plane or line, the slope is determined by the rise to run ratio. Where, Rise is the difference in elevation between two points. The horizontal shift between two places is known as a run.

Formula of slope = $\frac{y2-y1}{x2-x1}$ (equation 1)

According to the question the coordinates are: xi=2, x2=x, y1=6, y2=10

Given, rate of change=4 (here rate of change=slope)

Putting all coordinates in equation 1

Slope= $\frac{10-6}{x-2}$

4=4/x-2

x-2=1

x=3

Therefore, the missing value x=3

To know more about slope visit:

brainly.com/question/3605446

#SPJ9

4 0

1 year ago