20 key chains: 0.4x=50. Since they are parallel
Since it is as a ratio of 14:31 there has to be a factor of something. Let's assume this factor as x.
Therefore,
14x + 31x = 90
45x = 90
x = 2
So we have a factor of two. Plug x back into the equation.
The larger angle is 31 * 2 = 62 degrees.
Answer:
1) -5 and +5; 2) -9 and +9
Step-by-step explanation:
1) a² + 2ab + b² = 25
(a + b)² = 25 Wrote the left-hand side as a square
a + b = ±5 Took the square root of each side
All values of a + b are -5 and +5.
2) a² − 8ab + 16b² = 81
(a - 4b)² = 81 Wrote the left-hand side as a square
a - 4b = ±9 Took the square root of each side
All values of a - 4b are -9 and +9.
The expression would be v + 3. The sum means to add, you simply add v and 3.
