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Genrish500 [490]
3 years ago
11

Three-sevenths of a number is 21. Find the number.

Mathematics
1 answer:
expeople1 [14]3 years ago
4 0

Answer:

the number is 49

Step-by-step explanation:

please mark me brainly please!!!

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How many distinct triangles can be formed for which m∠X = 51°, x = 5, and y = 2? zero one two
Vitek1552 [10]
From the law of sines, we have:

\displaystyle{ \frac{\sin \angle X}{x}= \frac{\sin \angle Y}{y}, 

where x and y are the sides opposite to angles X and Y, respectively.


Substituting the known values, we have:



\displaystyle{ \frac{51^{\circ}}{5}= \frac{\sin \angle Y}{2}, thus

                           \displaystyle{ \sin \angle Y=\frac{\sin 51^{\circ}}{5}\cdot2\approx \frac{0.777}{5}\cdot2=0.31.


Using a calculator, we can find that arcsin(0.31)=18 degrees, approximately.

We know that sine of (180-18)=162 degrees is also 0.31. But 162 and 51 degrees add up to more than 180 degrees.

Thus, there is only one triangle that can be formed under these conditions.


5 0
3 years ago
Read 2 more answers
I need help with these two questions<br><br>​
Galina-37 [17]

Answer:

The first one: 19/15a

second one: b²-4ac = D

Step-by-step explanation:

for first one: take LCM and solve

for second one: you square the expression on both sides then b²= D + 4ac, then when you take 4ac to the left hand side, it becomes b²-4ac= D

6 0
2 years ago
Help please!!! Will mark as brain-list. Thank you
lord [1]

Answer:

Step-by-step explanatioi think it will be 24

7 0
3 years ago
Michael loves to run. It takes him 25.3 minutes to complete a 10 mile run. At this rate, how long would it take him to run 16 mi
m_a_m_a [10]

Answer:

0.632

Step-by-step explanation:

divide 16 ÷ 25.3 rurhrhr rhrhrhdh dhejejej ejehejeje behe

6 0
3 years ago
Round to<br> 237 divide by 4 = (hundredths)
irga5000 [103]
237/4 = 59.25

Hope that helps
4 0
3 years ago
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