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3 years ago

Evaluate the expression for the given value of x. 0.2x + 5.2 for x = −3

Mathematics

2 answers:

Lilit [14]3 years ago

5 0

Answer:

4.6

Step-by-step explanation:

Plug in the number when x= -3:

0.2*(-3)+5.2=4.6

Please give brainliest if this helps.

Ahat [919]3 years ago

4 0

Answer:

4.6 ya u got it lol hahah sorry

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2. If Sarah makes $11 per hour at her part time job and she works 20 hours in a week. How much is her weekly grass

Ahat [919]

Sarah makes 220 sorry if that’s wrong

8 0

2 years ago

Read 2 more answers

What is the sum?<br> 3/x +4/x^2

Karo-lina-s [1.5K]

Answer:

$\frac{3x + 4 }{x^{2}}$

Step-by-step explanation:

$\frac{3}{x}+ \frac{4}{x^{2}} = \frac{3*x}{x*x} + \frac{4}{x^{2}}$

$= \frac{3x}{x^{2}} + \frac{4}{x^{2}}\\\\\\=\frac{3x + 4 }{x^{2}}$

8 0

2 years ago

Professor Halen has 184 students in his college mathematics lecture class. The scores on the midterm exam are normally distribut

AURORKA [14]

Answer: 21

Step-by-step explanation:

Given : The scores on the midterm exam are normally distributed with

$\mu=72.3\\\\\sigma=8.9$

Let X be random variable that represents the score of the students.

z-score: $z=\dfrac{x-\mu}{\sigma}$

For x=82

$z=\dfrac{82-72.3}{8.9}\approx1.09$

For x=90

$z=\dfrac{90-72.3}{8.9}\approx1.99$

Now, the probability of the students in the class receive a score between 82 and 90 ( by using standard normal distribution table ) :-

$P(82$

Now ,the number of students expected to receive a score between 82 and 90 are :-

$184\times0.1146=21.0864\approx21$

Hence, 21 students are expected to receive a score between 82 and 90 .

5 0

3 years ago

Triangle ABC

Stolb23 [73]

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Let's solve for value of values of x and y ~

According to Angle sum property of triangles :

$\qquad \sf \dashrightarrow \: 70 \degree + 58\degree + x = 180\degree$

$\qquad \sf \dashrightarrow \: x\degree + 128\degree = 180\degree$

$\qquad \sf \dashrightarrow \:x = 180\degree - 128\degree$

$\qquad \sf \dashrightarrow \: x = 52\degree$

Now, solve for y ~

$\qquad \sf \dashrightarrow \: 70\degree + 49\degree + y = 180\degree$

$\qquad \sf \dashrightarrow \: y + 119 = 180\degree$

$\qquad \sf \dashrightarrow \: y = 180 - 119\degree$

$\qquad \sf \dashrightarrow \: y = 61 \degree$

Now, by the results we got, we can conclude that :

The two triangles are not similar because 70 + 58 + x = 180 means x = 52° and 70 + 49 + y=180 means y = 61°

8 0

2 years ago

Read 2 more answers

The question is about trigonometry solving two sides it is a right triangle hypotenuse is X left side is 20 bottom side is 21 i

elena55 [62]

Answer:

x = 29

Angle A = 46.4°

Angle B = 43.6°

Step-by-step explanation:

Since it is a right angle triangle, we can find x from pythagoras theorem;

x = √(20² + 21²)

x = √(400 + 441)

x = √841

x = 29

Using trigonometric ratios we can find angles A and B.

Opposite is 20

Adjacent is 21

Thus; opp/adj = tan B

20/21 = tan B

B = tan^(-1) 0.9524

B = 43.6°

Sum of angles in a triangle is 180°. Thus;

A = 180 - (90 + 43.6)

A = 46.4°

4 0

2 years ago