Answer:
B. 0.69
Step-by-step explanation:
Law of Cosines: cos A = (b² + c² - a²) / 2bc
cosθ = (7² + 11² - 8²) / 2*7*11 = 106/154 = 0.688 ≈ 0.69
Answer:
x = 4
y = 
Step-by-step explanation:
Ummmm
I'm not sure if this is corrrect but this is what I got
So first you solve 2x+4y=22 to find x
and you get x =
Then you have to subtitute
for
in 
which you then get y= 
After you have to subttitute y=
for y in x =
which you get as x=4
Finally you get the answer as:
x = 4
y = 
Answer:
m=31/2, n=-24. (31/2, -24).
Step-by-step explanation:
2m+n=7
4m+3n=-10
-------------------
n=7-2m
4m+3(7-2m)=-10
4m+21-6m=-10
-2m=-10-21
-2m=-31
2m=31
m=31/2
2(31/2)+n=7
31+n=7
n=7-31
n=-24
Answer:
8/15 is already a proper fraction, therefore it cannot be converted to a mixed number. Hope this helps!
Step-by-step explanation:
Answer:166
Step-by-step explanation:
SA=2lw+2lh+2hw so 2*4*5+2*7*5+2*7*4
so 40+70+56=166