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2 years ago

Find the value of x. HURRY PLEASE

Mathematics

2 answers:

svet-max [94.6K]2 years ago

6 0

Answer:

we have

x²+4=13[From the same external point, the tangent segments to a circle are equal.]

x²=13-4

x²=9

x²=3²

x=3

Mashutka [201]2 years ago

4 0

Answer:

x=3

Step-by-step explanation:

so...

13=x²+4.

start by subtracting 4 from each side to get the numbers on one side.

13-4=, and 4-4=0

now, we just have 9=x².

to undo a square, one must square root. so,

$\sqrt{9} = 3$

and

$\sqrt{x {}^{2} } = x$

now, x=3.

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List the sides of each triangle from shortest to greatest

True [87]

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So the largest side is AB.

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3 0

2 years ago

A strict inequality is graphed with a dotted line.<br> O True<br> O False

matrenka [14]

Answer:

True, a strict inequality would be graphed with a dashed line

5 0

2 years ago

A statistics practitioner in a large university is investigating the factors that affect salary of professors. He wondered if ev

Ulleksa [173]

Answer:

Step-by-step explanation:

Hello!

Given the linear regression of Y: "Annual salary" as a function of X: "Mean score on teaching evaluation" of a population of university professors. It is desired to study whether student evaluations are related to salaries.

The population equation line is

E(Y)= β₀ + β₁X

Using the information of a n= 100 sample, the following data was calculated:

R²= 0.23

Coefficient Standard Error

Intercept 25675.5 11393

x 5321 2119

The estimated equation is

^Y= 25675.5 + 5321X

Now if the interest is to test if the teaching evaluation affects the proffesor's annual salary, the hypotheses are:

H₀: β = 0

H₁: β ≠ 0

There are two statistic you can use to make this test, a Student's t or an ANOVA F.

Since you have information about the estimation of β you can calculate the two tailed t test using the formula:

$t= \frac{b - \beta }{\frac{Sb}{\sqrt{n} } }$ ~ $t_{n-2}$

$t= \frac{ 5321 - 0 }{\frac{2119}{\sqrt{100} } }$ = 25.1109

The p-value is two-tailed, and is the probability of getting a value as extreme as the calculated $t_{H_0}$ under the distribution $t_{98}$

p-value < 0.00001

I hope it helps!

3 0

2 years ago

Type the correct answer in each box. If necessary, use / for the fraction bar(s).

xz_007 [3.2K]

The value of x is 5/6 and y is 8/5.

Step-by-step explanation:

Given,

12x+15y=34 Eqn 1

-6x+5y=3 Eqn 2

Multiplying Eqn 2 by 2

$2(-6x+5y=3)\\-12x+10y=6\ \ \ Eqn 3$

Adding Eqn 1 and 3

$(12x+15y)+(-12x+10y)=34+6\\12x+15y-12x+10y=40\\25y=40$

Dividing both sides by 25

$\frac{25y}{25}=\frac{40}{25}\\y=\frac{8}{5}$

Putting y= 8/5 in Eqn 1

$12x+15(\frac{8}{5})=34\\12x+3*8=34\\12x+24=34\\12x=34-24\\12x=10$

Dividing both sides by 12

$\frac{12x}{12}=\frac{10}{12}\\x=\frac{5}{6}$

The value of x is 5/6 and y is 8/5.

Keywords: Linear equations, fractions

Learn more about fractions at:

#LearnwithBrainly

6 0

2 years ago

Read 2 more answers

I know the answer, but I have to show work as well. Please help!

vesna_86 [32]

I^75= i^18x4+3= i^3
i^2^1= i^2= 1.
-1 x i= -i

3 0

2 years ago