Shawna works at a local pet store. When she works 3 hours, she earns $27. When she works 8 hours, she earns $72. Which equation
2 answers:
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Answer:
$20
Step-by-step explanation:
First we will change the ratio so that we are finding how much money Siti receives to the total amount of money.
Now we can solve for how much money Siti receives using a proportion.
We can see that the denominator increases 5 times, so the numerator must increase 5 times too. This means Siti receives $20.
Answer:
see explanation
Step-by-step explanation:
Using the sum to product identity
cosx + cosy = 2cos( )cos(
)
Consider left side
(cos5A +cos3A) + (cos15A + cos7A)
= 2cos( )cos(
) + 2cos(
) cos(
)
= 2cos() cos(
) + 2cos(
)cos(
)
= 2cos4AcosA + 2cos11A cos4A ← factor out 2cos4A from both terms
= 2cos4A( cos11A + cosA) ← repeat the process
= 2cos4A( 2cos( )cos(
)
= 2cos4A(2cos()cos(
)
= 2cos4A(2cos6A cos5A)
= 4cos4Acos5Acos6A
= right side , thus verified