Answer:
101
Step-by-step explanation:
According to the Law of Cosines, for any △ABC with side lengths a, b, and c, a2=b2+c2−2bccosA; b2=a2+c2−2accosB; and c2=a2+b2−2abcosC
.
The Law of Cosines can be used because all three side lentghs are known.
Set up the equation for the Law of Cosines:
a2=b2+c2−2bccosA
Substitute the known values into the Law of Cosines:
312=222+182−2(22)(18)cosA
Square the values and multiply:
961=484+324−792cosA
Add:
961=808−792cosA
Subtract 808
from both sides:
153=−792cosA
Divide both sides by −792
:
153−792=cosA
According to this equation m∠A
is equal to the inverse cosine function of −153792
. Write this:
m∠A=cos−1(−153792)
Calculate the value of the inverse cosine −153792
on a calculator:
m∠A≈101°
Therefore, m∠A≈101°
.
Answer:
1 = 3
2= 21/5
3=5/6
4=3/8
Step-by-step explanation:
1 explanation
3/4 (8/2) =
(3/4) (8/2)=
(3)(4)/(4)(1)
12/4 =3
2 explanation
7/1(3/5) =
(7/1 ) (3/5) divide tht u get 21/5
3 explanation 5/6(1) =5/6
4 explanation
u rewrite the equation then
(3/4) (1/2
3x 1 is 3 4x 2 is 8 so 3/8
Number 2 is 100 cm
number 3 the height is equal to 5
NUMBER 4 b is equal to 13
Answer:
HMMM this? im not sure i hope this will help... Solve the equation: 7x 9 x x 7. ... 7. Graph the linear system and estimate the solution. x + y = 4 x y = 8 (, ) 4. Write the slope-intercept form of the line that passes through the point (5, 5) and has ... x. Find h(g()). 4 ... Simplify the given expression.xy(xy 5xy 7y ) 6x y 4 0x y 4xy 6x y 4 5xy 7y 6x y 4 5x y 7x y d. ... B 5. x log7 log4 5.
Step-by-step explanation:
