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skelet666 [1.2K]
2 years ago
15

22. A garage sale raise $400 for a school trip. Ir 15% of the money covered point

Mathematics
1 answer:
Over [174]2 years ago
7 0

Take 15% of 400, or 0.15 x 400

0.15 x 400 = 60

However, $60 is only the 15%.

Now, take away 60 from 400.

400 - 60 = 340.

So $340 went towards the trip.

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{4x-2y+5z=6 <br> {3x+3y+8z=4 <br> {x-5y-3z=5
lesya692 [45]

There are three possible outcomes that you may encounter when working with these system of equations:


  •    one solution
  •    no solution
  •    infinite solutions

We are going to try and find values of x, y, and z that will satisfy all three equations at the same time. The following are the equations:

  1. 4x-2y+5z = 6
  2. 3x+3y+8z = 4
  3. x-5y-3z = 5

We are going to use elimination(or addition) method

Step 1: Choose to eliminate any one of the variables from any pair of equations.

In this case it looks like if we multiply the third equation by 4 and  subtracting it from equation 1, it will be fairly simple to eliminate the x term from the first and third equation.

So multiplying Left Hand Side(L.H.S) and Right Hand Side(R.H.S) of 3rd equation with 4 gives us a new equation 4.:

4. 4x-20y-12z = 20      

Subtracting eq. 4 from Eq. 1:

(L.HS) : 4x-2y+5z-(4x-20y-12z) = 18y+17z

(R.H.S) : 20 - 6 = 14

5. 18y+17z=14

Step 2:  Eliminate the SAME variable chosen in step 2 from any other pair of equations, creating a system of two equations and 2 unknowns.

Similarly if we multiply 3rd equation with 3 and then subtract it from eq. 2 we get:

(L.HS) : 3x+3y+8z-(3x-15y-9z) = 18y+17z

(R.H.S) : 4 - 15 = -11

6. 18y+17z = -11

Step 3:  Solve the remaining system of equations 6 and 5 found in step 2 and 1.

Now if we try to solve equations 5 and 6 for the variables y and z. Subtracting eq 6 from eq. 5 we get:

(L.HS) : 18y+17z-(18y+17z) = 0

(R.HS) : 14-(-11) = 25

0 = 25

which is false, hence no solution exists



3 0
2 years ago
LMNO is a parallelogram, with and . Which statements are true about parallelogram LMNO? Select three options.
Bas_tet [7]

Answer:

I believe the correct options are 1, 4, and 5.

5 0
3 years ago
Read 2 more answers
QUICK I NEED THIS ANSWER QUICKLY
Ahat [919]
It’s A. The first option. Also pls brainlist
7 0
3 years ago
The position of a diving bell is −3/4 mile relative to sea level. The diving bell reached this position after dropping from sea
Natalija [7]
<span>After 1 hour, the diving bell was -1/2 mile relative to sea level. Since the rate of decent is constant, we can use two ratios to represent the depth at 2 different times. To make things easier to write, I'll use decimals to represent time and depth. -.75 / 1.5 = x / 1 Now solve for x -0.5 = x So after 1 hour, the diving bell was -1/2 mile relative to sea level.</span>
6 0
3 years ago
PLEASE HELP
Mumz [18]
If you use/make a number line, then you will see that the answer is -18 or a. When using a number line, negative = ← and positive = →.
6 0
3 years ago
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