1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
diamong [38]
3 years ago
15

Please Help Me With This Math. It's 4th Grade Math!!!

Mathematics
2 answers:
Debora [2.8K]3 years ago
8 0

Answer:

1  1/2 hours

=

Other ways to show would be;  = 1  1/2  hours =  1 .5 hrs  = 90 minutes

Step-by-step explanation:

We write out the question   2  1/4  -  3/4  =  ?

Then you use the model A below

Next you can add on from the smaller number 3/4 being step 1

And you use model B to find step 2 +  step 3 as it reminds  you that there is 1/4 in total time being the smallest box out of the sum.

step 1 =  3/4 + 1/4 = 1   = 1/4       is missing in A model box

step 2 = + 1   (to make 2)  = 1      is left in B model box

step 3 is + 1/4                                is left in B model box

Then add the up = 1/4 + 1 + 1/4   =  1 1/2

Your answers will be  model represents 3hrs divided into 6 hours

Jessi played in the afternoon

Playedi n afternoon for 1 1/2 hours

jolli1 [7]3 years ago
5 0

Answer:

1 1/2 hours

Step-by-step explanation:

You might be interested in
About 9% of the population has a particular genetic mutation. 900 people are randomly selected. Find the standard deviation for
timama [110]

Answer:

The standard deviation is of 8.586.

Step-by-step explanation:

For each person, there are only two possible outcomes. Either they have a genetic mutation, or they do not. The probability of a person having the mutation is independent of any other person, which means that the binomial probability distribution is used to solve this question.

Binomial probability distribution

Probability of exactly x successes on n repeated trials, with p probability.

The standard deviation of the binomial distribution is:

\sqrt{V(X)} = \sqrt{np(1-p)}

About 9% of the population has a particular genetic mutation.

This means that p = 0.09

900 people are randomly selected.

This means that n = 900

Find the standard deviation for the number of people with the genetic mutation in such groups of 900.

\sqrt{V(X)} = \sqrt{900*0.09*0.91} = 8.586

The standard deviation is of 8.586.

3 0
3 years ago
Find the coordinates of point b on ac such that the ratio of AB to BC is 2:1
riadik2000 [5.3K]

Answer:

(-2, 3)

Step-by-step explanation:

the point B is

B(x,y)

x

AB (A to B) is twice BC ( B to C )

AB is 2 - x. BC is x - (-4)= x + 4

So

2-x=2 (x + 4)

2-x=2x + 8

3x = -6

x = -2

y

(Same logic as above)

AB is -5 -y. BC is u - 7

-5 -y = 2(y - 7)

-5 - y = 2y - 14

3y = 9

y= 3

the point is (-2, 3)

5 0
3 years ago
The side length of each square is 6 units. Find the areas of the inscribed shapes.
kirill [66]

By using subtraction of <em>yellow</em> areas from the <em>entire</em> squares, the areas of the <em>inscribed</em> shapes are listed below:

  1. 18 units
  2. 20 units
  3. 12 units
  4. 12 units

<h3>How to calculate the areas of the inscribed shapes</h3>

The areas of the <em>inscribed</em> shapes can be easily found by subtracting the <em>yellow</em> areas from the square, in order to find the value of <em>green</em> areas. Now we proceed to find the result for each case by using <em>area</em> formulae for triangles:

Case A

A = 6² - 0.5 · (3) · (6) - 0.5 · (3) · (6)

A = 36 - 18

A = 18 units

Case B

A = 6² - 4 · 0.5 · (2) · (4)

A = 36 - 16

A = 20 units

Case C

A = 6² - 0.5 · 6² - 0.5 · 6 · 2

A = 36 - 18 - 6

A = 12 units

Case D

A = 6² - 2 · 0.5 · 6 · 4

A = 36 - 24

A = 12 units

To learn more on inscribed areas: brainly.com/question/22964077

#SPJ1

4 0
2 years ago
How much will you save if you buy an item listed at $75.50 at a 25% discount?
nalin [4]
25% of $75.50 is 18.87, so.... you would save $18.87 
3 0
4 years ago
Read 2 more answers
Which of the following is equivalent to (ab)4? a4b a4b4 ab4 4ab
Arada [10]
(ab)^4=a^4b^4
4 0
3 years ago
Read 2 more answers
Other questions:
  • What are the endpoint coordinates for the midsegment of <br> △JKL that is parallel to line JL?
    10·2 answers
  • in order to lose 1 pound a person needs to burn about 3,600 more calories than he or she eats and drinks. A person who weighs 15
    10·1 answer
  • Write a number that is the same when rounded to the nearest hundred and ten
    13·1 answer
  • For what side length(s) is the area of an equilateral triangle equal to 30 cm?? Only enter the number, in centimeters, rounded t
    13·1 answer
  • This is worth 15 points please help. What is the equation in y=mx+b. Read the directions correctly, please.
    12·2 answers
  • Hey! i’ll give brainliest please help
    6·1 answer
  • Please help and explain
    9·1 answer
  • 8. It takes Emory 3 hours to plant 12 flowers. How long should it take her to plant 40 flowers?
    14·2 answers
  • A jar contains only​ pennies, nickels,​ dimes, and quarters. There are 21 ​pennies, 26 ​dimes, and 15 quarters. The rest of the
    7·2 answers
  • 8374274 x 345<br> What is the answer?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!