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Finger [1]
2 years ago
12

Set up equations and solve them to find the unknown numbers in the following cases:

Mathematics
1 answer:
noname [10]2 years ago
3 0

Answer:

the answer is 21

Step-by-step explanation:

the number she thinks of is 21 add 21 + 19 to get 40.

divide 40 by 5 to get 8.

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Christian is a professional chef for a restaurant who also runs a small catering business. Christian did not have enough withhel
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3 years ago
What are the possible lengths of side Ab in a triangle which the given side lengths of 3 and 5 cm?
natali 33 [55]

Answer:

Plug this in a calculator and the answer will pop up.

Step-by-step explanation:

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5 0
3 years ago
One math class has a greater number of students than the other. However,
Elden [556K]
The classes could each have proportions of 5 boys to 6 girls, but they don’t necessarily have to be exactly 5 to 6. The number could 5 to 6 for one class, but it could also be 10 to 12 for another class, since 10 to 12 is a scale factor of 5 to 6.
4 0
2 years ago
Read 2 more answers
What is the solution of the matrix equation?
katrin [286]

Hello from MrBillDoesMath!

Answer:

The first choice ( -12, 20)



Discussion:

Using matrix multiplication we find the equations:


1x  + 1y = 8                     (A)

2x  + 3y = 36                   (B)


Next, compute

  2(A) - B  =>

         (2x + 2y) - (2x + 3y) = 2*8 - 36    =>

          (2x - 2x) + ( 2y-3y) = 16 - 36 =>

          -y = -20  =>

         y = 20


Substituting this y value in (A) gives

         x + 20 = 8 =>

         x = 8 - 20 =>

        x = -12


The answer is the first choice ( -12, 20)


Thank you,

MrB

6 0
3 years ago
What is a Cartesian plan?
nataly862011 [7]
I'm assuming you mean Cartesian plane. It is the same as a coordinate plane. There are two perpendicular lines with an x (horizontal) and y (vertical) axis. 
3 0
3 years ago
Read 2 more answers
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