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2 years ago

In how many ways can 13 students be seated in a row of 13 chairs if David, insists on sitting in the first chair?

Mathematics

1 answer:

Delvig [45]2 years ago

8 0

They can only sit one way because they are still in a row
Or did you mean like how many different ways can they sit?

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Courtney walked from her house to the beach at a constant speed of 4 kilometers per hour, and then walked

RUDIKE [14]

The system of equations that represents this situation are:

q + p = 2

4q + 5p = 8

Solution:

Let q be the number of hours it took Courtney to walk from her house to the beach

Let p be the number of hours it took her to walk from the beach to the park

The entire walk took 2 hours

Therefore,

q + p = 2 ------- eqn 1

The total distance Courtney walked was 8 kilometers

Total distance = 8 km

Courtney walked from her house to the beach at a constant speed of 4 kilometers per hour

Then walked from the beach to the park at a constant speed of 5 kilometers per hour

Distance is given as:

$distance = speed \times time$

From her house to the beach:

$distance = 4 \times q = 4q$

From the beach to the park:

$distance = 5 \times p = 5p$

We know that,

Total distance = 8 km

Therefore,

4q + 5p = 8 ------ eqn 2

Thus the system of equations that represents this situation are:

q + p = 2

4q + 5p = 8

8 0

3 years ago

Evaluate f(x) = 4x + 3x^2 − 5 when x = -2. 23 -1 -25 -49

frozen [14]

Answer:

f(-2) = -1

Step-by-step explanation:

One way of doing this is to substitute -2 for x in every place where x shows up:

f(x) = 4x + 3x^2 − 5 → f(-2) = 4(-2) + 3(-2)^2 − 5

→ f(-2) = -8 + 3(4) - 5, or f(-2) = 4 - 5, or f(-2) = -1

5 0

3 years ago

The cost of a pair of boots at a certain store is 145% of the cost of a pair of sneakers. The pair of sneakers costs $21.

Vilka [71]

Answer:

so $21+45%=30.45. meaning that pair of boots cost 30.45 so two pairs of boots would cost $60.90

5 0

2 years ago

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solniwko [45]

Answer:

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Step-by-step explanation:

TIENES TAREA

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3 years ago

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Anarel [89]

Answer: A. 12^2

Step-by-step explanation: Follow PEMDAS

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2 years ago