I have a Triangle and I need to find the side BC?
Answers
introduced to a little bit of trigonometry. Or at least you've seen the
definitions of the trig functions of angles.
Do you remember the definition of either the sine or the cosine of an angle ?
In a right triangle, the sine of an acute angle is (opposite side) / (hypotenuse),
and the cosine of an acute angle is (adjacent side) / (hypotenuse).
Maybe you could use one of these to solve this problem, but first you'd need to
make sure that this is a right triangle.
Let's see . . . all three angles in any triangle always add up to 180 degrees.
We know two of the angles in this triangle ... 39 and 51 degrees.
How many degrees are left over for the third angle ?
180 - (39 + 51) = 180 - (90) = 90 degrees for the third angle.
It's a right triangle ! yay ! We can use sine or cosine if we want to.
Let's use the 51° angle.
The cosine of any angle is (adjacent side) / (hypotenuse) .
'BC' is the side adjacent to the 51° angle in the picture,
and the hypotenuse is 27 .
cosine(51°) = (side BC) / 27
Multiply each side of that equation by 27 :
Side-BC = (27) times cosine(51°)
Look up the cosine of 51° in a book or on your calculator.
Cosine(51°) = 0.62932 (rounded)
Side BC = (27) x (0.62932) = 16.992 (rounded)
============================================
You could just as easily have used the sine of 39° .
That would be (opposite side) / (hypotenuse) ... also (side-BC) / 27 .
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Answer:
C ) 18 hope this helps !!!
Answer:
C. 18
Step-by-step explanation:
If you multiply 30%, or .3 by 60, you get 18.
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y=childern
x+y=90
24.50x+13.75y=1560
so
mutliply the first equation by -13.75 and add to second equaiton
-13.75x-13.75y=-1237.5
24.50x+13.75y=1560 +
10.75x+0y=323
10.75x=322.5
divide both sides by 10.75
x=30
x=30
sub back
x+y=90
30+y=90
minus 30 both sides
y=60
x=30
y=60
30 adults
60 kids
Solve to find x and y in the diagram.
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99 = 21x + 15
84 = 21x
x = 4
There are four people in the family!
B: 3 C:All real numbers
D:No solution
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Answer:
The answer is C:All real solutions
Step-by-step explanation:
here are the steps in case u need them :)
Step 1: Simplify both sides of the equation.
−2(x+3)=−2x−6
(−2)(x)+(−2)(3)=−2x+−6(Distribute)
−2x+−6=−2x+−6
−2x−6=−2x−6
Step 2: Add 2x to both sides.
−2x−6+2x=−2x−6+2x
−6=−6
Step 3: Add 6 to both sides.
−6+6=−6+6
0=0
Answer:
C: All real numbers.
Step-by-step explanation:
-2 ( x + 3 ) = -2x -6
-2 times x, -2 times 3
-2x -6 = -2x -6
Add 6
-2x -6 +6 = -2x -6 +6
-2x = -2x
same as....
0 = 0
B. 0.2, 1/4, 3/8, 7/8, 0.8
C. 1/4, 0.2, 3/8, 7/8, 0.8
D. 0.8, 1/4, 3/8, 0.2, 7/8
Answers
Answer:
It’s a
Step-by-step explanation:
Tell me if I’m wrong