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3 years ago

Please answer now! i will mark brainliest!

Mathematics

1 answer:

podryga [215]3 years ago

5 0

Answer:

I would round to 3, so the length of the sidewalk would be about 8 x 3 = 24 feet.

Step-by-step explanation:

$2\frac{5}{6}$ is closer to 3 and if you convert it to decimal which will be 2.83 with a bar on top of 3, it's still close to 3.

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Solve the system: 2/x - 3/y =-5; 4/x + 6\y =14

sertanlavr [38]

The solution is $x = 2 \text{ and } y = \frac{1}{2}$

Solution:

Let us assume,

$a = \frac{1}{x}\\\\b = \frac{1}{y}$

Given system of equations are:

$\frac{2}{x} - \frac{3}{y} = -5$

$\frac{4}{x} + \frac{6}{y} = 14$

Rewrite the equation using "a" and "b"

2a - 3b = -5 ------------ eqn 1

4a + 6b = 14 -------------- eqn 2

Let us solve eqn 1 and eqn 2

Multiply eqn 1 by 2

2(2a - 3b = -5)

4a - 6b = -10 ------------- eqn 3

Add eqn 2 and eqn 3

4a + 6b = 14

4a - 6b = -10

( - ) --------------------

8a = 4

$a = \frac{4}{8}\\\\a = \frac{1}{2}$

Substitute a = 1/2 in eqn 1

$2(\frac{1}{2}) -3b = -5\\\\1 - 3b = -5\\\\3b = 6\\\\b = 2$

Now let us go back to our assumed values

Substitute a = 1/2 in assumed values

$a = \frac{1}{x}\\\\\frac{1}{2} = \frac{1}{x}\\\\x = 2$

Substitute b = 2 in assumed value

$b = \frac{1}{y}\\\\2 = \frac{1}{y}\\\\y = \frac{1}{2}$

Thus the solution is $x = 2 \text{ and } y = \frac{1}{2}$

3 0

3 years ago

Professor Tangent was stumped. His research assistant had given him a riddle but she simply could not solve. Help the professor!

melomori [17]

Answer:

difficult but easy do it yourself you can do you can do you can do bro ...

8 0

3 years ago

James folds a square piece of in half to create a rectangle with a perimeter of 12 inches. What is the original square?

PilotLPTM [1.2K]

24 inches. You could simply multiply by 2. Do you want another solution?

3 0

3 years ago

Read 2 more answers

A random sample of 11 university students produced the following data, where x is the minutes spent studying per day, and y is t

SIZIF [17.4K]

Answer:

16.373,16.4

Step-by-step explanation:

Given that a random sample of 11 university students produced the following data, where x is the minutes spent studying per day, and y is the first exam score (out of a maximum of 100 points).

x y

11 39

13 55

14 43

17 46

19 69

22 75

24 77

25 78

28 77

31 93

34 92 Observations 11

ANOVA

df SS MS F Significance F

Regression 1 3214.095153 3214.095153 69.46052448 1.59367E-05

Residual 9 416.4503017 46.27225574

Total 10 3630.545455

Coefficients Standard Error t Stat P-value Lower 95% Upper 95% Lower 95.0% Upper 95.0%

Intercept 16.37281677 6.48384963 2.525169105 0.0324919 1.705329914 31.04030362 1.705329914 31.04030362

x 2.369323595 0.28428592 8.33429808 1.59367E-05 1.726224167 3.012423023 1.726224167 3.012423023

We get regression line as y =2.369x+16.373

a) value of intercept = 16.373

b) 16.4

8 0

3 years ago

What are the factors of 36 and 90?

Aleksandr [31]

The factors of 36 are 36, 18, 12, 9, 6, 4, 3, 2, 1.
The factors of 90 are 90, 45, 30, 18, 15, 10, 9, 6, 5, 3, 2, 1.

5 0

3 years ago

Read 2 more answers