3 years ago

Felipe made $168 for 8 hours of work. At the same rate, how much would he make for 18 hours of work?

Mathematics

1 answer:

MrMuchimi3 years ago

3 0

Answer: $378

Step-by-step explanation: 18/8=2.25

Multiply 2.25 and 168 to get 378

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Keiko has seven colors of lanyard. She uses three different colors to make a keychain. How many different combinations can she c

AleksAgata [21]

Combination = doesn't matter what order
Permutation = order matters

There are <u>two</u> methods to work out combinations.

Method 1 List out possibilities
123 124 125 126 127 134 135 136 137 145 146 147 156 157 167
234 235 236 237 245 246 247 256 257 267
345 346 347 356 357 367
456 457 467
567

For a total of 35 combinations.

Method 2 Use a formula.
It's a rather complicated one, so only use it if you have a lot of possibilities.

$\frac{n!}{r!(n-r)!} = \frac{7!}{3!(7-3)!} = \frac{7!}{3!*4!} = \frac{7*6*5*4*3*2*1}{3*2*1*4*3*2*1} = \frac{7*6*5}{3*2*1}=\frac{210}6=35$

(n is the number of choices, r is the amount you choose, and ! is a function that multiplies together all numbers down to 1)

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4 years ago

The Park family was traveling to Disney World on vacation. They drove 487.5 miles in 7.5 hours. At this rate, how many miles did

andrew-mc [135]

They drove 65 miles per hour

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3 years ago

Find g(9) if g(x) =2 (x+3)-4

ikadub [295]

Answer:

Step-by-step explanation:

g(9)=2 since g(x)=2