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Mekhanik [1.2K]
3 years ago
5

Can someone help me solve these three problems please??

Mathematics
1 answer:
Tasya [4]3 years ago
4 0
I'll solve 21, and you then should be able to solve the rest on your own!

Since ADC is 135, that means that that whole angle is 135 degrees. In addition, since angles ADB and BDC add up to ADC, we get ADB+BDC=ADC=135=11x+9+7x=18x+9. Subtracting 9 from both sides, we get 126=18x. Dividing both sides by 18, we get x=7. Plugging that into 11x+9=BDC, we get 11*7+9=77+9=86
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A triangle has side lengths of 5a +3 inches and 2a +3 inches. If the perimeter of the triangle is 3a + 12 inches, which expressi
JulsSmile [24]

Answer:

A. 2a+6

Step-by-step explanation:

I did the test and this is what I got.

7 0
2 years ago
Se arrastra un bloque de 18 kg a través de una superficie con una fuerza de 300 N en donde el coeficiente de fricción de dicha s
ozzi

Answer:

10.9\ \text{m/s}^2

Step-by-step explanation:

m = Masa del bloque = 18 kg

F = Fuerza en el bloque = 300 N

\mu = Coeficiente de fricción = 0.6

El equilibrio de fuerzas del sistema viene dado por

F-f=ma\\\Rightarrow 300-0.6\times 18\times 9.81=18a\\\Rightarrow a=\dfrac{300-0.6\times 18\times 9.81}{18}\\\Rightarrow a=10.9\ \text{m/s}^2

La aceleración del bloque es 10.9\ \text{m/s}^2.

8 0
3 years ago
A number that when added to another number equals zero
FinnZ [79.3K]
-2+2=0 because on the number line -2 is two spots from 0 then when u add a positive 2 it equals 0.
3 0
3 years ago
Read 2 more answers
Use the set B = {5, 7, 9, 11} to determine n(B).<br> n(B) = 0
kkurt [141]

9514 1404 393

Answer:

  n(B) = 4

Step-by-step explanation:

There are four (4) elements in set B.

  n(B) = 4

5 0
2 years ago
Find the equation of the line parallel to the graph of 4x-5y=-1 that contains the point (1,3)
rewona [7]

Answer:

To find the equation of the line parallel to the graph, first of all find the slope of the graph by making y the subject of the formula and comparing the resulting equation with y = mx + c , knowing fully well that m stands for the slope.

So, from the equation of the graph give, y = 4x/5 +1/5, therefore the slope is 4/5. For a line to be parallel to the graph then they must have the same slope, to find the equation of the line at the given point, then we use the formula

y - y1 = m ( x - x1 )

y - 3  = 4/5 ( x - 1 )

multiply through by 5

5( y - 3 ) = 4 ( x - 1)

5y - 15 = 4x - 4

 5y - 4x = - 4 + 15

so,  5y - 4x = 11 is the equation

Step-by-step explanation:

4 0
2 years ago
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