Answer:
11(7+4)=121
Step-by-step explanation:
Answer:
6^540
Step-by-step explanation:
Cos(17pi/8)
cos(17π/8)
But π radians = 180°
17π/8 radians = (17/8) * 180 = 382.5
But this is more than 360°, so we have the basic angle by subtracting 360°
382.5 - 360 = 22.5
cos(17π/8) = Cos22.5
Recall double angle formula for cos.
cos2θ = 2cos²θ - 1
Therefore
cos(2*22.5) = 2cos²(22.5) - 1
cos45 = 2cos²(22.5) - 1
(√2)/2 = 2cos²(22.5) - 1
2cos²(22.5) - 1 = (√2)/2
2cos²(22.5) = (√2)/2 + 1
2cos²(22.5) = (2 + √2) / 2
cos²(22.5) = (2 + √2) / 4
cos22.5 = √( (2 + √2)/4) ................(note)
cos22.5 = √(2 + √2) / 2
Option (a) seems like the closest, comparing to (note) above.
Ok so what you would do is find 15% of 50 and that would be 7.5 (if you did it as a decimal) then you would do 50-7.5 and that would be how much more Madeline will have to save.
The problem can be modeled like this:
x - 6 + 7 = 65
x + 1 = 65
x = 64
The number is 64. Since -6 + 7 = 1, you could have also simplified the question to, "A number is 65 when you add 1. What is the number?"