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S_A_V [24]
3 years ago
10

(3x-8) + (-4x+9)​ idk

Mathematics
1 answer:
lesya [120]3 years ago
8 0
Answer= 19

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21 is what percent of 40
-Dominant- [34]
To solve for this, set up a proportion.
21/40 = x/100.
Cross multiply the fraction's numerators with the denominators; 
21 x 100, 40 and x.
2100/40x.
Divide both numbers by 40 to get x.
2100/40 = 52.5
21 is 52.5% of 40.
I hope this helps!
5 0
3 years ago
Which property can be justified using the ratios in triangle XYZ ?
Alenkasestr [34]
The correct answer is B.

Determine and recall first the trigonometric functions:

Sin A = Opposite/Hypotenuse
Cos A = Adjacent/Hypotenuse
Tangent = Opposite/Adjacent

If for example we try to take an angle, for example the Y, then Y is opposite Y. The Hypotenuse will be the longer side which is going to denoted by X and the next side will be Adjacent which will be denoted by Z. 

Use this test to answer:

Sin Y = Y/X

where:

Y = opposite
X = hypotenuse 

Cos (90 - y) = cos (90 - 50) = cos 40

where Z = 40
we look for cos Z = Y/X

Therefore,

Sin Y = Cos (90 - Y) 

6 0
2 years ago
Read 2 more answers
if a tree casts an 8 meter shadow, and the angle from the ground to the tree is 30 degrees, what is the approximate height of th
Virty [35]
Using SohCahToa, we can find the height of the tree. Let the tree height be h. 8m is adjacent to the 30° angle.
\tan(30)  =  \frac{h}{8}  \\ h = 8 \tan(30)  \\ h = 4.62
The answer is A) 4.6 m
3 0
3 years ago
Helpppp plzzzzzzzzzzzzzzzz
mariarad [96]
I’m a bit confused by the choices you have been given. Are there any other options? If not, I would choose (5.3,9.8) as 9.8 is correct

8 0
3 years ago
4 out of 5 U.S. homeowners have a cell phone.what percent of homeowners do not have a cell phone?
timama [110]
Percent means parts out of 100
x/100=x%

4/5=x%
4/5=x/100
times 100 oth sides
400/5=x
80=x
80% do
100-do=do not have
100-80=20
answer is 20%
7 0
3 years ago
Read 2 more answers
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