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3 years ago

John is going for a walk. He walks for 6.4 miles at a speed of 2 miles per hour. For how many hours does he walk?

Mathematics

1 answer:

KonstantinChe [14]3 years ago

8 0

Answer:

t = d/s

t = 6.4 / 2 miles

t = 3.2 miles

Step-by-step explanation:

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Aaaaa it like a test

Harman [31]

Answers below.

Decimal: 1.2

Percent: 120%

-zomba

3 0

3 years ago

Read 2 more answers

Subtract the quantity 10x + 5y - 4z from the sum of the quantities 7z + 3y - 10x and 9x - 12y - z

AleksandrR [38]

Answer:

11x + 14y - 10z

Step-by-step explanation:

firstly deal with sum part and then subtract,making sure that you add and subtract values with the same unknowns

(7z + 3y - 10x) + (9x - 12y - z)

then

(10x + 5y - 4z) - (6z - 9y - x)10

8 0

3 years ago

If a ball is thrown into the air with a velocity of 38 ft/s, its height in feet t seconds later is given by y = 38t − 16t2. (a)

tiny-mole [99]

Answer:

i.-34ft/s

ii.-27.6ft/s

iii.-26.8ft/s

iv-26.7ft/s

B.-26ft/s

Step-by-step explanation:

$average velocity = \frac{y_{2}-y_{1}}{t_{2}-t_{1}}\\$

For all cases the value of the initial time $t_{1} =2 seconds \\$

now we also use this time ti determine the value of the initial height in all cases

$y_{1}=38(2)-16(2)^{2} \\y_{1}= 12ft\\$

now when the time is increase by 0.5 seconds the new height becomes

$y_{2}=38(2.5)-16(2.5)^{2} \\y_{2}=-5fts\\$

the velocity becomes

$[tex]Average velocity = \frac{-5-12}{2.5-2}\\Average velocity = -34ft/s\\$

ii. when the time is increase by 0.1 seconds

the new height becomes

$y_{2}=38(2.1)-16(2.1)^{2} \\y_{2}= 10.66ft\\$

$Average velocity = \frac{10.66-12}{2.05-2}\\Average velocity = -27.6ft/s\\$

iii. when the time is increase by 0.05 seconds

the new height becomes

$y_{2}=38(2.05)-16(2.05)^{2} \\y_{2}= 9.24ft\\$

$Average velocity = \frac{9.24-12}{2.05-2}\\Average velocity = -26.8ft/s\\$

iv. when the time is increase by 0.1 seconds

the new height becomes

$y_{2}=38(2.01)-16(2.01)^{2} \\y_{2}= 11.73ft\\$

$Average velocity = \frac{11.73-12}{2.01-2}\\Average velocity = -26.7ft/s\\$ .

B. For us to determine the instantaneous velocity expression, we differentiate the expressing for the height

$V_{inst}=38-32t\\$

we now substitute t=2, we arrive at

$V_{inst}=-26ft/s\\$

6 0

4 years ago

Please help! I don't wanna fail!

ahrayia [7]

Answer:

32.55

Step-by-step explanation:

3 0

3 years ago

Which is another way to write the expression r•(18-3)

Whitepunk [10]

The r variable outside the parentheses can multiply both the numbers in the parentheses.

This called distributing the r. We are using the distributive property.
The distributive property states that a(b + c) = ab + ac.

r(18 - 3) = 18r - 3r

So, (r * 18) - (r * 3) is the answer.

5 0

3 years ago