Answer:
13.2
Step-by-step explanation:
multiply 6.3×4
she swims 6.3 hours per week for 4 weeks. to find the answer you just need to multiply then together
Answer:
18
Step-by-step explanation:
Even functions (like this one) are symmetric to the y-axis. So even if you reflect it over the y-axis it will look the same :)
Cos9x - cos5x = -2sin2x.sin7x
sin17x - sin3x = 2sin7x.cos10x
so f(x) =

=