Mathematics High School

In a class of 28 students, 21 have a brother and 9 have a sister. There are 7 students
who have a brother and a sister. What is the probability that a student chosen
randomly from the class has a brother and a sister?

Answers

Answer 1

1/4

because not a lot of students have both gender as siblings!

Answer 2

Answer:

Step-by-step explanation:

28 students in total

21 - 7 = 14 students only has a brother

9 - 7 = 2 students only have a sister

7 students have both brothers and sisters

probability of a student having a brother and a sister:

[tex]\frac{7}{28} = \frac{1}{4}[/tex]

Related Questions

Written in standard form, the equation y = mx + b becomes

Answers

The answer is C because when changing the equation Freon slope form to standard you flip the signs of the variables
The answer would be letter A

Which letter matches the angle?

Answers

Answer:
1: F
2: A, E
3: C
4: D

Why?
Linear angles are = 180 so answer 3 might be also but Im pretty sure it’s not

Answer:

F, Vertical angles.

Step-by-step explanation:

If you need extra visuals, this might help:

"The angles opposite each other when two lines cross. They are always equal.

In this example a° and b° are vertical angles.

"Vertical" refers to the vertex (where they cross), NOT up/down. They are also called vertically opposite angles."

I need help. Do not post a link to a site!

Find the value of each variable.

Answers

Answer:

the answer is x=45⁰ y=45⁰

may I help you

Can someone plz help me with this !!!

Answers

Answer:

Yes!

Step-by-step explanation:

The y = -17

The x = 18

y = x-35

-17 does equal 18 - 35

Hope that helps!

Step-by-step explanation: no it dosent i dont think

Find the value or measure. Assume that all segments that appear to be tangent are tangent. Round answers to the nearest tenth, as needed.

Answers

Answer:

23.26

Steps:

AC=√(10²+21²)

AC=√(100+441)

AC=√541

AC≈23.26

hey could somebody help me please :)

Answers

Answer:

Cut them in smaller shapes then find area

Step-by-step explanation:

Vanessa throws a tennis ball in the air. The function h(t) = -15t2 + 45t + 10 represents the distance in feet, that the ball is from the ground at any time in seconds, t. What is the maximum height of the ball?

Answers

Answer:

43.75feet

Step-by-step explanation:

Given the height of the tennis ball expressed as;

h(t) = -15t^2 + 45t + 10

At maximum height, the velocity of the ball is zero

v = dh/dt

dh/dt = -30t + 45

Since dh/dt = 0, hence;

0 = -30t + 45

30t = 45

t = 45/30

t = 3/2

t = 1.5secs

Substitute t = 1.5 into the expression given

h(1.5) = -15(1.5)^2 + 45(1.5) + 10

h(1.5) = -15(2.25)+67.5+10

h(1.5) = -33.75+77.5

h(1.5) = 43.75feet

Hence the maximum height of the ball is 43.75feet

Graph the inequality and check the solution.
Waseme swam more than 100 laps.

l > 100

A number line going from 0 to 200.

Check all that apply.

A. Draw a closed circle at 100.

B. Draw an open circle at 100.

C. Shade all numbers to the right of 100.

D. Shade all numbers to the left of 100.

E. 150 is shaded, so substitute 150 in for the variable to check the graph of the solution.

F. 50 is shaded, so substitute 50 in for the variable to check the graph of the solution.

Answers

Answer:

bce

on edg

Step-by-step explanation:

How do I solve this math problem 2x-3<-7

Answers

Answer:

bobo ka mag isip ka mag sagot ka magisa mo

Hopes this helps:

Answer: x < -2

1. Add 3 to both sides.
2x < -7 + 3

2. Simplify -7 + 3 to -4.
2x < -4

3. Divide both sides by 2.
X < -4/2

4. Simplify 4/2 to 2.
X < -2

If one side of a triangle is 87 and the other side is 52, what is the measurement of the other side?

Answers

Answer:

87+52=139 180-139 = 41

41 is the measurement of the other side

Step-by-step explanation:

A store purchased jeans for $15 a pair. The store increased the price of the jeans by 65%. One month later, the jeans were on sale for 15 - off the store price. How much would a customer pay for the jeans on sale? Please help

Answers

Answer:

$21.04

Step-by-step explanation:

Steps to take to derive the answer

Determine the price after the price increase of 65%Determine the price after the 15% off

Price after increase increase (100% + increase in price) x purchase price of the jeans

(100% + 65%) x 15

165% x 15

1.65 x $15 = $24.75

Price after the decrease in price = (100% - percentage decrease in price) x price after the 65% increase in price

(100% - 15%) x $24.75

85% x $24.75

0.85 x $24.75 = $21.04

`what is the sooulition to x + 8 = 25

Answers

Answer:

17

Step-by-step explanation:

Well you have to get x by itself so....

subtract 8 from both sides

25 -8 = 17 there is your answer

Hey there!


x + 8 = 25

SUBTRACT 8 to BOTH SIDES

x + 8 - 8 = 25 - 8


SIMPLIFY IT!

x = 25 - 8

x = 17


Therefore, the answer should be: x = 17


Good luck on your assignment & enjoy your day!


~Amphitrite1040:)

Which statement accurately describes the graph 2y=4x+8?


IM IN A TEST HURRY PLEASE!!

Answers

You didn’t give us the statements, send a picture or something.

The statement which describes the given line the best is required.

The correct statement is an increasing line that passes through [tex](0,4)[/tex]

Equation of lines

The given equation is [tex]2y=4x+8[/tex]

Two points of the line are

[tex]x=0[/tex]

[tex]2y=0+8\\\Rightarrow y=4[/tex]

[tex](0,4)[/tex]

[tex]y=0[/tex]

[tex]0=4x+8\\\Rightarrow x=-2[/tex]

[tex](-2,0)[/tex]

The line passes through points [tex](0,4),(-2,0)[/tex]

The slope intercept form of the line is

[tex]y=\dfrac{4x+8}{2}\\\Rightarrow y=2x+4[/tex]

The slope is [tex]2[/tex]

Since, the slope is positive the line is increasing.

Learn more about equation of lines:

https://brainly.com/question/13763238

PLSSS HELPPPP I WILLL GIVE YOU BRAINLIEST!!!!!! PLSSS HELPPPP I WILLL GIVE YOU BRAINLIEST!!!!!! PLSSS HELPPPP I WILLL GIVE YOU BRAINLIEST!!!!!! PLSSS HELPPPP I WILLL GIVE YOU BRAINLIEST!!!!!!PLSSS HELPPPP I WILLL GIVE YOU BRAINLIEST!!!!!! PLSSS HELPPPP I WILLL GIVE YOU BRAINLIEST!!!!!! PLSSS HELPPPP I WILLL GIVE YOU BRAINLIEST!!!!!!

Answers

Answer:

268.083

Step-by-step explanation:

volume of a sphere = 4/3 times pi times r^3. 4/3(pi)(4^3) = 268.083

PLSS HELPPP DUEE TODAYY Problem #1 Simplify the expression.

Answers

Answer:

B

Step-by-step explanation:

+/- 7 is the sq root of 49

hope this helps

Help ASAP!
553.168 L = mL

Answers

1mL = 0.001 L
so 553168mL

Instructions: Find the missing length indicated.

Answers

Answer:If you are following a area of a triangle is bxhx1/2 or bxh/2

1,800

Step-by-step explanation:100x36=3,600/2=1,800

Divide. (8x2 – 24x + 15) ÷ (2x – 5)

Answers

Answer:

31-24x/2x-5

Step-by-step explanation:

multiply: (16-24x+15)/(2x-5)

calculate: (31-24x)/(2x-5)

write the division as a fraction:  31-24x/2x-5

a living room is 20 feet long, 50 feet wide and 12 feet high. how much paint do you need to cover the walls?
a. 2680ft ^2
b. 3680ft ^2
c. 4680ft ^2
d. 1680ft ^2

Answers

Answer:

d

Step-by-step explanation:

What is the equation of the line that passes through the point (-6,3) and has a
slope of -1/6?

Answers

Answer:

y = -1/6x + 2

Step-by-step explanation:

Put it in point-slope form:

y - 3 = -1/6(x + 6)

y -3 = -1/6x - 1

y = -1/6x + 2

I need help question in picture

Answers

Area formula of a circle = πr2

π (8.5)2
Area= 226.98

it's is A= pi x r x 2^

diameter is 17 divide by two is the radius

3.14 x 8.5 x 8.5 is 226.865

help please????????????​

Answers

Answer:

1st one is correct ....................

Answer:

x = 8, y = 12

Step-by-step explanation:

Since the triangles are congruent, we know that the parallel sides are equal to each other.

So,

4x - 7 = 3x + 1

4x - 3x = 1 + 7

x = 8

x + y = 20

8 + y =20

y = 20 - 8

y = 12

In triangle ABC, angle C is a right angle. Find the value of the trig function.
Find the cos(A) if c= 15, a=9, b= 12

Answers

Answer:

its a

Step-by-step explanation:

what is 11 times 1/5

Answers

Answer:

the answer is 2.2

Step-by-step explanation:

I used a calculator

Answer:

2 1/5 I guess

Step-by-step explanation:

If it's wrong then my phone's stu.pid

There are 12 boys and 13 girls in a class. If the teacher randomly chooses a student's name out of a hat, what is the probability it will be a girl?

◯ 48%
◯ 50%
◯ 52%
◯ 92%

Answers

The probability of selecting a girl is 52%

How to determine the probability?

The given parameters are:

Boy = 12

Girl =13

The probability of selecting a girl is:

P(Girl) = Girl/Total

This gives

P(Girl) = 13/(12 + 13)

Evaluate

P(Girl) = 52%

Hence, the probability it will be a girl is 52%


Read more about probability at:

https://brainly.com/question/251701

#SPJ1

Someone help plz make sure it’s right :)

Answers

Answer:

6 m

Step-by-step explanation:

By Pythagoras Theorem:

[tex]x = \sqrt{ {10}^{2} - {8}^{2} } \\ \\ x = \sqrt{100 - 64} \\ \\ x = \sqrt{36} \\ \\ x = 6 \: m[/tex]

Step-by-step explanation:

10² = 8² + x²

x² = 10² - 8²

x² = 36

x = √36

x = 6

Work out m and c for the line: y+2x=3

Answers

Answer:

m = - 2, c = 3

Step-by-step explanation:

The equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

Given

y + 2x = 3 ( subtract 2x from both sides )

y = - 2x + 3 ← in slope- intercept form

with m = - 2 and c = 3

Which of the following is closest to the distance between P and Q?

Answers

Answer:45.3 ft

Step-by-step explanation: Is your answer.

20 POINTS HELP ASAP
determine wether the equation is an identity or not an identity. sin theta/ cos theta

Answers

Answer:

A

Step-by-step explanation:

Find the value or measure. Round answers to the nearest hundredth, as needed.

Answers

Don’t click linkkkkkkkkkkkkk
Other Questions
What is the constant of proportionality of the following equation?B = 1.25C Given sinx=1/3, cosy=3/4, and both x and y are in quadrant iv, find cos(x-y) and sin(x+y) How can you determine if the given lines are perpendicular? Need help quickly please Why does Theophilus Freeman refuse to sell emily berry to Northup's master? PLEASE, I REALLY NEED YOUR HELP!! For each of the figures, write an Absolute Value equation to satisfy the given solution set. Hola a todos... me ayudan?Necesito pasar estos numeros a nros naturales, enteros y racionales:-1530,5+21desde ya gracias :) Corey exerts a force of 35 N and moves a crate 3 m. How much work has he done on the crate?15 J105 J 5 Protons {+} 5 Electrons {-}6 Neutrons {0}What element is this ? please be as soon as possible. Which angles are adjacent to each other I need help on this homework 5) According to Frederick Douglass, what to the slave is the 4th of July?Helpppppo Wichita Industries' sales are 10% cash and 90% on credit. Credit sales are collected as follows: 40% in the month of sale, 50% in the next month, and 10% in the second following month. On December 31, the accounts receivable balance includes $21,000 from November sales and $51,000 from December sales. Assume that total sales for January are budgeted to be $59,000. What are the expected cash receipts for January from the current and past sales? Identify each of the patterns labeled in the ridge pattern diagram explain what is meant by' leading fast food outlets' which fractions are less than 1/2.MORE THAN ONE ANSWER Juice Wrld OR XXXTENTACION please help I have tried over and over and can't get it The hexagon PQRSTU is plotted on a coordinate plane with vertices P(1, 0), Q(1, 3), R(1, 4), S(2, 5), T(4, 4), and U(4, 0). What is the hexagon's perimeter?