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
Dafna11 [192]
3 years ago
8

Subtracting Fractions 13 minus 12/40 equals

Mathematics
1 answer:
olga_2 [115]3 years ago
6 0

Answer:

12 7/10

Step-by-step explanation:

13  - 12/40

Simplify the fraction

13 - 3/10

Borrow 1 from 13 in the form of 10/10

12 + 10/10 - 3/10

12 7/10

You might be interested in
Why do you flip the equation when solving something like 10>-9x+10?
Karolina [17]
You flip the sign from > to < only when you are dividing by a negative number and in this case it would be negative 9. 
7 0
3 years ago
How many lines of symmetry does a rhombus that is not a square have?
adoni [48]
Look ar the picture.

Your answer: 2 lines of symmetry.

7 0
3 years ago
Sara is 6 feet 3 3/4in tall and Sam is 5 feet 6in. How much taller is Sara then Sam?
denpristay [2]

Answer:

9    3/4  inches

Step-by-step explanation:

If we are finding how much taller Sara is, we need to subtract

6 ft 3 3/4 - 5 ft  6in

I like to line up vertically

  6 ft 3 3/4

- 5 ft  6in

----------------

We  need to borrow 1 ft and make it 12 inches


  5 ft 3+12  3/4

- 5 ft  6in

----------------

   5 ft 15  3/4

- 5 ft  6in

----------------  

  0     9    3/4  inches

3 0
3 years ago
A balloon rises at the rate of 10 ft/sec from a point on the ground 100 feet from an observer. Find the rate of change of the an
lubasha [3.4K]

The rate of change of the angle of elevation of the balloon from the observer when the balloon is 100 feet above the ground is  1/20 degree/sec.

<h3>What is angle of elevation?</h3>

It is described as a relationship between an oblique line from the observer's eye to an item above his eye and the horizontal plane. This angle eventually develops above the surface. The angle of elevation is made in such a way that it is above the observer's eye, as the name suggests.

Calculation for the rate of change of angle of elevation-

According to the question,

A balloon rises at the rate of 10 ft/sec from a point on the ground 100 feet from an observer.

The balloon is 100 feet above the ground.

Let the height of the balloon be 'h' ft.

Then tanØ = h/100

h = 100tanØ

Differentiate the above equation with respect to time.

dh/dt = 100 sec² Ø (dØ/dt)

We know dh/dt = 10 ft/sec.

when h = 100

tanØ = 100/100 = 1/1

tanØ = Perpendicular/Base

On comparing above two equations,

Perpendicular = 1; Base = 1.

By Pythagoras the hypotenuse is,

H² = P² + B²

    = 1² + 1²

    = 2

H = √2

Now, calculate the value of cosØ.

cosØ = B/H = 1/√2

Squaring both side

cos² Ø = 1/2

sec² Ø = 1/cos² Ø

sec² Ø = 2

The main equation was,

dh/dt = 100 sec² Ø (dØ/dt)

Substitute the values,

dØ/dt = (dh/dt )/100 sec² Ø

         = (10)/(100×2)

dØ/dt = 1/20 degree/sec.

Therefore, the rate of change of the angle of elevation of the balloon from the observer is  1/20 degree/sec.

To know more about the angle of elevation, here

brainly.com/question/9817377

#SPJ4

8 0
1 year ago
How many solutions does the system have?<br>20x - 5y = 5<br>4x- y = 1​
irga5000 [103]

Answer:

Infinate

Step-by-step explanation:

If you multiply all factors in the secon eqation by 5, you will get the first eqation.

Therefore for any value of x you can find y, thus having an infinate number of x,y pairs

7 0
3 years ago
Other questions:
  • If twice a number is at least three less than four times the number, which of the following are true? Let n represent the number
    15·1 answer
  • Solve for x. (e^x-e^-x)/((e^x+e^-x)=t
    10·2 answers
  • I need help please and thank you
    13·1 answer
  • Find the polynomial function
    7·1 answer
  • Please help math part2
    10·1 answer
  • The number of visitors to an annual neighborhood carnival increased each year as shown in the table. Predict the number of visit
    6·1 answer
  • Jina's dance recital started at 4:46 PM. It ended at 6:13 PM. How long did the recital last?
    10·2 answers
  • I’ll be very grateful for anyone’s help I added a photo of the question
    12·2 answers
  • Which statement describes the solution to this system of equations?
    12·1 answer
  • Volume with fractions 3 28 points
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!