MATHEMATICS MIDDLE SCHOOL

7:6=21: what is the ratio

Answers

Answer 1
Answer: 7:6 = 21:x
x = 6/7 x 21
= 18

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Ana buys a sweater for $25.60, and it is on sale for 35% off. What is the amount of the discount?

I need help fast will give brainiest!!!!

Answers

Answer:

71

Step-by-step explanation:

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PLEASE HELP I GIVE THANKS

Answers

1. A. a translation 3 units to the right
2. 4 units up
From what I can tell, the answer to the first problem is A, and the answer to the second problem is 4 units up.
The reason the first answer is A, is because if you count from point C to point K there is a total of three squares. Also, rotating and reflecting this image would give you different results.
The second answer is 4, because counting from A to A' there are a total of 4 squares (units), hence the answer of four.

Add −8/15+4/15.

A. 4/15

B. 4/5

C. −12/15

D. −4/15

Answers

Answer:

d. -4/15

Step-by-step explanation:

since the denominators are the same, all u have to do is add -8 and 4

-8+4=-4

then plug in the denominator and it would be -4/15. this is the final answer because it also cannot be simplified further
D. -4/15
Also you can use calculator soup for fractions that’s what I use

Abigail has a 12-ounce glass. She drinks 3/4 of the glass. how many ounces of the glass did she drink.

Answers

If the glass is 12 ounces, and she drank 3/4 of the glass, then our answer will be 3/4 of 12.

3/4 x 12 = 36/4 = 9

Abigail drank 9 ounces.
Answer: 9 ounces

Work: 12 ÷ 4 = 3     
            3 x 3 = 9

Answer: 9 ounces

a juggler throws a ball into the air, releasing it 5 feet above ground with an initial velocity if 15 fps. she catches the ball in thr other hand 5 feet above the ground. How long was the ball in the air?

Answers

Final answer:

The juggled ball was in the air for roughly 0.94 seconds. Using the principles of projectile motion and gravity, you calculate the time for the ball to rise to its peak and then double this value to get the total time the ball is in the air as it follows the same path back down.

Explanation:

The question is about determining the time a juggled ball stays in the air when thrown up at a particular speed and height. The principles of projectile motion and gravity apply here. The time taken for the ball to rise and fall back to the same height can be found using the physics concept of free fall. While the ball is in the air, it rises and then falls to a final position which is equal to its starting altitude. This is because the ball is thrown and caught at the same height.

From the facts we have, the initial vertical speed is 15 fps (feet per second). Since the acceleration due to gravity is -9.8 m/s² or approximately -32.2 fps² (note that it is negative as it is acting downward), we can use the following equation of motion which is derived from Newton's second law:

final velocity = initial velocity + (acceleration x time)

In this case, the final velocity when the ball reaches the peak of its flight is 0 (since it stops for a moment before falling again), and the acceleration is -32.2 fps². If we rearrange the equation to solve for time (t), we get:

t = (Final velocity - Initial velocity) / acceleration. Substituting the values we get:

t = (0 - 15) / -32.2 = 0.47 s

This is the time taken for the ball to go up. However, the ball takes the same amount of time to come down, so we multiply this by 2 to get the total time the ball is in the air:

Total time = 0.47 x 2 = 0.94 seconds, approximately.

So, the ball was in the air for roughly 0.94 seconds.

Learn more about Projectile Motion here:

brainly.com/question/29545516

#SPJ2
Problems of this sort are frequently found in physics.  If you study calculus or physics you'll learn how to create the equation representing the velocity of an object in flight.

Here, you don't need to calculate velocity, but rather time.  Start with this equation:

v = v0 + a t^2, where v is the velocity at time t, v0 is the initial velocity, a is the acceleration due to gravity (denoted by g instead of a), and t is the elapsed time.

You are told that v0 is 15 ft/sec.  Set v = to 0, as the ball stops moving for the tiniest instant at the top of its trajectory.  Use g = - 32 ft (per second squared).

Then  0 = 15 ft/sec - 32 [ft/(seconds squared)] t.

Solve this for t.  This is the time required for the ball to come to a complete stop at the top of its trajectory.  

Finally, multiply this time by 2, since the ball begins to fall and returns to its original height.

A 1-day movie rental at red box costs $1.39. For each additional day there is a fee of $0.50. How much will it cost to rent a movie for 7 days?

Answers

It will cost a total amount of $4.89 to rent a movie for 7 days

Word Problem

Given Data

  • Cost per day =   $1.39
  • Fee per additional day = $0.50
  • Number of added days = 7

Let us find the mathematical expression for the above question

Total Cost = 1.39+ 0.5*7

Total cost = 1.39+ 3.5

Total cost = $4.89

Learn more about Word Problem here:

brainly.com/question/25693822
Lets just simply solve:-

Days:-   1         2          3        4          5         6         7                                     
           1.39 + 0.50 + 0.50 + 0.50 + 0.50 + 0.50 + 0.50 = Cost to rent a movie for 7 days. 

 1.39 + 0.50 + 0.50 + 0.50 + 0.50 + 0.50 + 0.50 =  4.39

So, to rent a movie for 7 days it would cost $4.39.

Hope i helped ya!! 
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