Sin x = cos (90-x)
eg sin 42 = cos(90-42) = cos 48
so the answer is B
Length of room = area / width
Length of room = 56/7 = 8 feet.
She will need 7 + 7 + 8 + 8 = 30 feet of border.
Answer: 10
Step-by-step explanation:
Given : Total number of coins tossed = 10
Possible outcomes to toss a coin = Head or tail
Number of possible outcomes = 
Number of ways of obtaining exactly 1 heads = 
[using combinations 
]
=10
Hence, the numbers of ways of obtaining exactly 1 heads= 10
Answer:
Step-by-step explanation:
Let the number be x,
4x+5 = 3(x-2)
4x+5 = 3x-6
Collect like terms
4x-3x = -5-6
x. = -11
PLEASE GIVE BRAINLIEST.
Answer:
6 minutes
Step-by-step explanation:
'a' in the formula represents altitude in feet. You are told the altitude is 21000 feet, so put that into the formula:
21000 = 3400t +600
You can solve this for t:
20400 = 3400t . . . . . subtract 600 from both sides
6 = t . . . . . . . . . . . . . . . divide both sides by 3400
The problem statement tells you that t represents minutes after lift off, so this solution means the altitude is 21000 feet 6 minutes after lift off.
The question is asking for the number of minutes after lift off that the plane reaches an altitude of 21000 feet, so this answers the question directly:
The plane is at an altitude of 21000 feet 6 minutes after lift off.
