Answer:
Addition Property of Equality
Step-by-step explanation:
You are adding 3/4 to both sides to isolate the <em>x</em>.
Answer:
perimeter of rectangle = 2(l+b)
= 2 (9+5)
= 2 X 14
= 28 cm
is the perimeter of rectangle
Answer:
x=-10
Step-by-step explanation:
6x+4=5x-6
Subtract 5x from each side
6x-5x+4=5x-5x-6
x +4 = -6
subtract 4 from each side
x+4-4 = -6-4
x=-10
Answer:
170°
Step-by-step explanation:
Let a be the distance from Los Angeles to Chicago = 1744 miles, b be the distance from Chicago to New York = 714 miles and c be the distance from New York to Los Angeles = 2451 miles.
A is the angle opposite to side a, B is the angle opposite to side b and C is the angle opposite to side c.
Therefore the angle at Chicago is C.
From cosine rule:
c² = a² + b² - 2ab × cos (C)
2ab × cos (C) = a² + b² - c²
cos (C) = (a² + b² - c²) / 2ab
Substituting:
cos (C) = (1744² + 714² - 2451²) / 2×1744×741
cos (C) = -0.986
C = cos⁻¹ (- 0.986) = 170°
Answer:
f(3) = 7
Step-by-step explanation:
Substitute x = 3 into f(x) , that is
f(3) = 4(3) - 5 = 12 - 5 = 7