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. cos(
![7 \pi /12](https://tex.z-dn.net/?f=7%20%5Cpi%20%2F12)
) is the same thing as cos(π/3 + <span>π/4) and then you use the formula cos(a + b) = cos(a)cos(b) + sin(a)sin(b)</span>
The answer is 8 because when you replace x by 8 it equals 24
It takes 4 3/8 hours if you travel at an average speed of 80km/hr
Step-by-step explanation:
<em>When he retired in 1997 his card was worth $4.51 The value has increased by $1.02 each year since then. </em>
<em />
<em>Express the relationship relating the value of the card y in dollars and the number of years x </em>
<em />
y = <em>$1.02 </em>x + <em>$4.51 </em>
<em />
<em>Is the relationship between x and y proportional?</em>
Yes. This is because as x increases, the value of y also increases.
What was the value of the card in 2008?
Number of years from 1997 to 2008 = x = 11
y = $1.02 x + $4.51
y = $1.02 (11) + $4.51
y = $ 11.22 + $4.51
y = $ 15.73