$a_2=2\cdot a_1\\ a_3=3\cdot a_2=3\cdot 2\cdot a_1\\ a_4=4\cdot a_3=4\cdot3\cdot 2\cdot a_1\\ a_5=5\cdot a_4=5\cdot 4\cdot3\cdot 2\cdot a_1\\ \\ a_n=n\cdot (n-1)\cdot (n-2)\cdot (n-3)\cdot\ ...\ \cdot3\cdot2\cdot a_1=n!\cdot a_1\\ \\ a_n=3\cdot n!$

4 0

3 years ago

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A sock drawer contains 5 different colors of socks. It has 20 white, 10 black, 10 gray, 6 red, and 4 purple. If you

djyliett [7]

Answer:

Added all together= 50

Black socks= 10

10/50

Step-by-step explanation:

8 0

3 years ago

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A car service charges $3.50 for the first ½ mile, and additional mileage is charged at the rate of $0.50 for each additional 0.1

matrenka [14]

Answer:

4 miles

Step-by-step explanation:

Given that:

Charges for the first $\frac{1}2$ mile = $3.50

Tip given to driver = $4

Charges for additional 0.1 mile = $0.50

Total money available = $25

To find:

Total number of miles that a person can ride?

Solution:

Let us have a look at the money left after charges for the first $\frac{1}{2}$ mile and tip.

$\Rightarrow \$3.50 + \$4 = \$7.50$

Money left = $25 - $7.50 = $17.50

$0.50 is required for the distance = 0.1 mile

$1 is required for the distance = 0.2 miles

$17.50 is required for the distance = 0.2 $\times$ $17.50 = 3.5 miles

Total distance traveled = First half mile + Distance traveled with the amount of money remaining as calculated above. = 0.5 + 3.5 = <em>4 miles</em>

8 0

3 years ago