Final answer:
To write the rate as a simplified fraction, divide the amount of money by the number of CDs and simplify the fraction if possible. The rate is $20/9.
Step-by-step explanation:
To write the rate as a simplified fraction, we need to divide the amount of money ($140) by the number of CDs (63). To find the angle of intersection between two planes, calculate the angle between their normal vectors using the dot product and magnitudes This can be done by setting up a ratio with the amount of money in the numerator and the number of CDs in the denominator:
$140 / 63.
Since both numbers are divisible by 7, we can simplify the fraction:
$140 ÷ 7 / 63 ÷ 7 = $20 / 9.
Therefore, the rate is $20/9.