Answer:
98 m
Step-by-step explanation:
A 1/2 is the same as 0.5 and % means out of a 100

Answer:
C) cos A=sin B
Step-by-step explanation:
A is complement of B: A+B=90⁰
Sin(A)=sin(90-B)=cos(B)
Cos(A)=cos(90-B)=sin(B)
So c)
Cos (x+y)/cos x sin y
= cos x cos y - sin x sin y / cos x sin y
= cos x cos y/cos x sin y - sin x sin y / cos x sin y
hope this helps
Answer:
x is equal to 2.5 and -4.5
Step-by-step explanation:
-4(x + 1)² - 3 = -51
-4(x² + 2x + 1) - 3 = -51
-4x² - 8x -3 - 3 = -51
-4x² - 8x - 6 = -51
-4x² - 8x = -45
-4(x^2 + 2x) = -45
-4(x^2 + 2x + 1) = -49
-4(x + 1)² = -49
(x + 1)² = 49/4
x + 1 = ± √(49/4)
x + 1 = ± 7/2
x = -1 ± 3.5
x = 2.5, -4.5