The COsine is the COmplementary trigonometric function of the sine. Remember what complementary angles are? They are angles which add up to 90º. So if you take the sine of a certain angle, it is equal to the value of the cosine of that complementary angle. For example, sin(30º)=cos(60º), because 60º is the complementary of 30º.
So, in 240 miles can be made by 2 hours.
Do this equation:
240 × 2 = 480 / 4 hours.
You cannot do 3 because it won't fit another 240 miles.
Next, subtract the 480 miles from 600 miles.
600 - 480 = 120
Also, if you would've divided by 2 hours.
240 ÷ 2 = 120 / 1 hour
Add the hours.
4 + 1 = 5 hours
It takes 5 hours to travel 600 miles by the small plane.
Ryan was 8 when his parents invested $4000 in a certificate of deposit that pays 6%. If Ryan leaves the account alone until the investment doubles, how old will he be? (Assume that the interest is not compounded.)
<span>This one has a twist to it in that it tells you that the interest is not compounded. </span>
<span>They need to earn $8,000 - $4,000 = $4,000 in interest. </span>
<span>They earn $4,000 X 6% = $240 in interest per year. </span>
<span>$4,000 / $240 = 16.67 </span>
<span>16.67 + 8 = 24.67 </span>
<span>Ryan will be 24 and 8 months old when the investment doubles. </span>
<span>2.)Benjamin has $6000 invested in two accounts. One earns 8% interest per year, and the other pays 7.5% interest per year. If his total interest for the year is $472.50, how much is invested at 8%? </span>
<span>X = the amount invested at 8% </span>
<span>($6,000 - X) = the amount invested at 7.5% </span>
<span>So: </span>
<span>.08X + .075(6,000 - X) = $472.50 </span>
<span>Now solve: </span>
<span>.08X + 450 -.075X = $472.50, this reduces to </span>
<span>.005X = $22.50, which finally reduces to </span>
<span>X = $4,500 </span>
<span>So $6,000 - X = $1,500 </span>
<span>So the answer is: $4,500 is invested at 8% </span>
<span>Test the result </span>
<span>$4,500 X 8% = $360.00 </span>
<span>$1,500 X 7.5% = $112.50 </span>
<span>$360.00 + $112.50 = $472.50, and you've proved your answer</span>
Yeah I think it is True cause make sence