Answer:
Step-by-step explanation:
Sin80° = opp/hyp
Sin80° = 21/y
ysin80° = 21
y = 21/sin80°
y = 21.3
You take the first equation and make a value for y. So 6x + y =7 change it to :
y = -6x + 7
Now in the second equation replace the “y” with -6x +7 this is what it means to use substitution method . Your combined equation will now be :
8x + 9(-6x + 7) =17
Now do distributive property and you get :
8x + -54x +63 =17
Now combine like terms ;
-46x +63 =17
-46x =-46
x = 1
Now replace 1 for X value and we can get the value of Y .
Y=1
X=1
Answer:
you can use decimals
Step-by-step explanation:
The equation which is used to determine x, the width of the window is, 
. Option B shows the correct expression for width x of the window.
<h3>
What are length and width?</h3>
Length is describing how long is the object. The width is defined as how wide is the object.
Given that the width of the window is 4.9 feet. The length is given as 0.6 feet less than 2.5 times its width.
The height of the window is given as,
The other height of the window is given as,
When equating both equations, we get,
Therefore, an equation which is used to determine x, the width of the window is, . Option B shows the correct expression for width x of the window.
To know more about the length and width, follow the link given below.
brainly.com/question/3133832.
A= P(1 + r/n) ^nt
21000=7000(1+0.055/2)^1t
t = 20.52 years
