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2 years ago

8

two times a number plus three times a number equals 13. The sum of two numbers is 7. what are the numbers? write the numbers for

least to greatest.

1 answer:

wel2 years ago

7 0

Answer:

4

Step-by-step explanation:

$2+ 3 = 5 \\13-5= 8\\8 divided by 2=4 \\x=4$

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If two angles of a triangle are 10 degrees and 20 degrees, then the triangle is ????

Wewaii [24]

Answer:

Scalene

Step-by-step explanation:

Because all triangular angles add up to 180 degrees.

10+20=30

180-30=150

None of those angles are the same.

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2 years ago

Read 2 more answers

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Inessa [10]

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3 years ago

A side of 6 feet, and a 120° angle<br> A. One<br> B. None. C. Many

pshichka [43]

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2 years ago

g Given the system of equations: 15 c1 – 5 c2 – c3 = 2400 - 5 c1 + 18 c2 – 6 c3 = 3500 - 4 c1 - c2 + 12 c3 = 4000 (a) Calculate

denpristay [2]

Answer

(a)

$A^{-1} = \frac{1}{3493} \begin{pmatrix} 210 && -59 && -12 \\ 84 && 176 && 95 \\ 77 && -5 && 295 \end{pmatrix}$

(b)

$A^{-1} b = \begin{pmatrix} \frac{500}{7} \\\\ \frac{2400}{7} \\\\ \frac{2700}{7} \end{pmatrix}$

Step-by-step explanation:

Remember that when you want to solve a problem like this, you express the equation as following

$Ax = b$

So, if you know the inverse of $A$ then

$x = A^{-1} b$

For this case

$A = \begin{pmatrix} 15 && 5 && -1 \\ -5 && 18 && -6 \\ -4 && -1 && 12 \end{pmatrix}$

Now for this case the inverse of A would be

$A^{-1} = \frac{1}{3493} \begin{pmatrix} 210 && -59 && -12 \\ 84 && 176 && 95 \\ 77 && -5 && 295 \end{pmatrix}$

Then when you multiply with the vector solution

$A^{-1} b = \frac{1}{3493} \begin{pmatrix} 210 && -59 && -12 \\ 84 && 176 && 95 \\ 77 && -5 && 295 \end{pmatrix} * \begin{pmatrix} 2400 \\ 3500 \\ 4000 \end{pmatrix} = \frac{1}{3493} \begin{pmatrix} 249500 \\ 1197600 \\ 1347300 \end{pmatrix}\\\\\\= \begin{pmatrix} \frac{500}{7} \\\\ \frac{2400}{7} \\\\ \frac{2700}{7} \end{pmatrix}$

So from that information you can conclude that the solution to the system of equations is x = 500/7 y = 2400/7 and z = 2700/7

7 0

2 years ago

When parallelogram EFGH is rotated 180° counterclockwise about the origin to create parallelogram E'F'G'H', what is the measure

Akimi4 [234]

Answer:

The measure of angle G is 108 Degrees, hope this helps.

Step-by-step explanation:

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3 years ago