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miss Akunina [59]
3 years ago
6

Which expression is equivalent to the given expression?

Mathematics
2 answers:
Dimas [21]3 years ago
7 0
B.) 13·19-13x This is because the 13 has to be multiplied/sprinkled to all the terms in the parenthesis.
Agata [3.3K]3 years ago
5 0
\rm 13(19-x)=13*19-13*x=\boxed{\rm B}
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I dont really know how to do soh cah toah. please help me find x.
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First notice that the triangle with sides x,y,a and the triangle with sides z,a+b,x are similar. This is true because the angle between sides x,y in the smaller triangle is clearly 30^\circ, while the angle between sides y,z in the larger triangle is clearly 60^\circ. So the triangles are similar with sides x,y,a corresponding to a+b,z,x, respectively.

Now both triangles are 30^\circ-60^\circ-90^\circ, which means there's a convenient ratio between its sides. If the length of the shortest leg is \ell_1, then the length of the longer leg is \ell_2=\sqrt3\ell_1 and the hypotenuse has length \ell_3=\sqrt{{\ell_1}^2+{\ell_2}^2}=2\ell_1.

Since x is the shortest leg in the larger triangle, it follows that a+b=2x, so a+b=15=2x\implies x=\dfrac{15}2
4 0
3 years ago
the density of a substance is 2.5 cm calculate the volume of the substance if its mass is 25.0 grams​
sesenic [268]

Answer:

10 cm³

Step-by-step explanation:

The equation for density is: d = m/v, where d is the density, m is the mass, and v is the volume.

Here, d = 2.5 and m = 25.0, so plug these into the equation to solve for v:

d = m/v

2.5 = 25/v

Multiply both sides by v:

2.5v = 25

Divide by 2.5:

v = 25/2.5 = 10

Thus, the volume is 10 cm³.

7 0
2 years ago
Please Help :)<br> Set up the equation and find the length of BC.
Kamila [148]

Answer:

BC= 29

Step-by-step explanation:

If the total, AC, is 54 and AB is 25 subtract those two to find the last part, BC.

7 0
2 years ago
Find the missing side or angle.<br> Round to the nearest tenth.<br> C=5<br> b=4<br> a=2<br> B=[ ? ]°
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Step-by-step explanation:

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