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3 years ago

Average speed is calculated by dividing total distance with the time it takes to complete it. True False

Mathematics

1 answer:

Aliun [14]3 years ago

4 0

Answer:True

Step-by-step explanation:

Average speed refers to the total distance covered in a specific time . it also a scalar quantity (has magnitude but no direction)

Average speed=distance / time

-Speed is in kilometers/hours or meter/seconds

-distance is in kilometers or meters

-time is in hours or seconds

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Evaluate 13 - 0.75w+8x when w=12 and x= 1 over 2

Zepler [3.9K]

Answer:

Step-by-step explanation:

Given:

13 - 0.75w + 8x

where,

w = 12

x = 1/2

13 - 0.75w + 8x

Substitute the value of w and x into the equation

= 13 - 0.75(12) + 8(1/2)

= 13 - 9 + 8/2

= 13 - 9 + 4

= 8

Therefore,

13 - 0.75w + 8x = 8

6 0

2 years ago

A large emerald with a mass of 378.24 grams was recently discovered in a mine. If the density of the emerald is 2.76grams over c

bogdanovich [222]

Answer:

Volume of emerald = 137.04cm³

Step-by-step explanation:

Given that:

Mass of emerald = 378.24grams

Density of emerald = 2.76grams/cm³

Volume = ?

The equation for this relationship is ρ = m / V in which ρ is density, m is mass (kg or g) and V is volume (cm³ or m³) making the density unit kg/m³ or g/cm³.

Therefore

Density = mass/volume

Volume = Mass/density

i.e

Volume of emerald = Mass of emerald / Density of emerald

Volume of emerald = 378.24grams / 2.76grams/cm³

Volume of emerald = 137.043cm³ ~137.04cm³

Volume of emerald =137.04cm³

6 0

3 years ago

Sue planted 4 times as many apple seeds as she planted orange seeds. 15 percent of the apple seeds grew into trees, and 10 perce

tatiyna

Answer: 600

Step-by-step explanation:

Given : Sue planted 4 times as many apple seeds as she planted orange seeds. 15 percent of the apple seeds grew into trees, and 10 percent of the orange seeds grew into trees

Let x be the number of apply seeds and y be the number of orange seeds , the we have the following equations:-

$x=4y$ (1)

$0.15x+0.10y=420$ (2)

Put x= 4y in (2), we get

$0.15(4y)+0.10y=420$

$0.60y+0.10y=420$

$0.70y=420$

Divide both sides by 0.70.

$y=600$

Hence, Sue planted 600 orange seeds.

7 0

3 years ago

What is 20 min ealy than 12:00

Alekssandra [29.7K]

Answer:

11:40

Step-by-step explanation:

6 0

2 years ago

Read 2 more answers

The population P of rabbits on a small island grows at a rate that is jointly proportional to the size of the rabbit population

user100 [1]

Answer:

Option D:

$\frac{dP}{dt} = kP(2400 - P)$

Step-by-step explanation:

Differential equation:

For the population in function of the time, is:

$\frac{dP}{dt}$

The population P of rabbits on a small island grows at a rate that is jointly proportional to the size of the rabbit population and the difference between the rabbit population and the carrying capacity of the population

Carring capacity is 2400.

This means that the differential equation is kP(size of the population multiplied by the constant) multiplied by 2400 - P(difference between the population and the carrying capacity). So

$\frac{dP}{dt} = kP(2400 - P)$

So the answer is given by option D.

8 0

2 years ago