The cosine for ∠A is 
.
Option: A.
<u>Step-by-step explanation:</u>
From the given diagram,
Opposite = 8 ft.
Adjacent = 5 ft.
In trigonometry, the formula for cosine = 
.
We are not given with hypotenuse. So we have to find the hypotenuse using Pythagorean Theorem 
.
.
hypotenuse = 
.
cosine = 
.
Multiply 
in both numerator and denominator,
The cosine for ∠A is .
<span>3. Subtraction Property of Equality; Multiplication Property of Equality
Subtracting seven from both sides is the justification for step b to get rid of the positive seven on both sides. Multiplying by 2 on both sides to get rid of the fraction on the left side of the equation is the justification for step d.
</span>
Answer:
x=5.333
y=3
Step-by-step explanation:
given, y=5-2............(1)
1-3x+y=-12...............(2)
y=5-2=3
put y=3 in equ (2)
1-3x+3=-12
1+3+12=3x
3x=16
x=
x=5.333
hence, x=5.333
y=3 answer
