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Murljashka [212]
3 years ago
14

1. Timika is a counselor at a summer camp for young children. She wants to take 20 campers on a hike and wants to

Mathematics
1 answer:
OLga [1]3 years ago
3 0

Answer: N = 20C2 = 190

Therefore, Timika has 190 ways of choosing the pairs of children to lead the way

Step-by-step explanation:

Given;

Total number of children = 20

Number of children to lead the way = 2

Since all the children have equal possibilities of being selected to lead the way, and for the order is not important.

Then the number of ways to select two leaders from 20 children will be given by;

N = 20C2 = 20!/2!(20-2)! = 20!/2!18!

N = 20 × 19/2

N = 190

Therefore, Timika has 190 ways of choosing the pairs of children to lead the way

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An airplane travels 800 miles with the wind in the same of time it takes to travel 650 miles against the wind. What is the speed
SOVA2 [1]

Answer:

90 mph

Step-by-step explanation:

Against wind DATA:

distance = 600 miles ; time = 5 hrs. ; rate = 600/5 = 120 mph

With wind DATA:

distance = 600 miles ; time = 2 hrs ; rate = 600/2 = 300 mph

Equations:

p + w = 300

p - w = 120

2p = 420

p = 210 mph (speed of the plane in still air)

Since p+w = 300, w = 300-210 = 90 mph (speed of the wind)

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Hola !

The answer is = (-4) as in the attachment provided

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6 0
3 years ago
15% of people on the beach do not wear sun screen. If 30 people don't wear sunscreen, what is the total number of people at the
lara [203]

Answer: The information you are given shows that 15% = 30. Multiply 30 by 6 and 2/3 (The number of times 15 goes into 100) and you have your answer. There are 200 people on the beach.

6 0
3 years ago
Determine whether the study depicts an observational study or an experiment. Thirty university students are divided into two gro
alex41 [277]

Answer:

The provided study is an experiment.

Step-by-step explanation:

Consider the provided information.

Observational study: In this study observer only observe the subjects, and measure variables of interest without allocating treatments to subjects.

For example: you want to examine the  side effect of smoke on lung.

Experiment study:The researchers are applying treatments to experimental units in the research, then the effect of the treatments on the experimental units is observed.

For example: Flipping a coin

Now consider the provided information:

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Here, the researcher applying treatment to experimental units.

Thus, the provided study is an experiment.

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