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andriy [413]
3 years ago
5

James drives a distance of 320 miles in 4 hours. What was his speed?

Mathematics
1 answer:
Nataly_w [17]3 years ago
5 0

Answer: D

Step-by-step explanation:

because 320/4 = 80 mi/hr because it can not km or min and hr^2 would not make any sense

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Part ion even know of the hardest test
ladessa [460]

Given:

The equation of a line is:

y=-\dfrac{5}{7}x+2

A line passes through the point (-5,-3) and perpendicular to the given line.

To find:

The equation of the line.

Solution:

Slope intercept form of a line is:

y=mx+b                 ...(i)

Where, m is the slope and b is the y-intercept.

We have,

y=-\dfrac{5}{7}x+2          ...(ii)

On comparing (i) and (ii), we get

m=-\dfrac{5}{7}

We know that the product of slopes of two perpendicular lines is always -1.

m_1\times m_2=-1

-\dfrac{5}{7}\times m_2=-1

m_2=\dfrac{7}{5}

Slope of the required line is \dfrac{7}{5} and it passes through the point (-5,-3). So, the equation of the line is:

y-y_1=m_2(x-x_1)

y-(-3)=\dfrac{7}{5}(x-(-5))

y+3=\dfrac{7}{5}(x+5)

Using distributive property, we get

y+3=\dfrac{7}{5}(x)+\dfrac{7}{5}(5)

y+3=\dfrac{7}{5}x+7

y=\dfrac{7}{5}x+7-3

y=\dfrac{7}{5}x+4

Therefore, the equation of the line is y=\dfrac{7}{5}x+4. Hence, option A is correct.

4 0
3 years ago
What is 8 raised to the -2/3 power? I need help
Naddik [55]

Answer:

The answer will be 0.25 or 1/4

Step-by-step explanation:

8^(-2/3)= 0.25

HOPE THIS HELPS!! PLEASE GIVE BRAINIEST!!

7 0
3 years ago
Solve 15 and 21, will give BRAINLIST!!
xeze [42]

Answer:

Step-by-step explanation:

<h2>4/x=2/10</h2>

cross multiplication:

4*10=2*x

40=2x

x=40/2=20

<h2>w/2 = 4.5/6.8</h2>

6.8w=2(4.5)

6.8w=9

w=9/6.8=1.32352941

4 0
2 years ago
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Melissa has enough paint to cover an area of 250 square feet.she want to paint two walls.the rectangular wall is 9 feet high and
liraira [26]

Answer:

No she doesn't have enough paint.

Step-by-step explanation:

You have to find the area of both walls then subtract both areas by 250. It would give you a negative number, meaning there is not enough paint.

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2 years ago
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Please help I need it
alexira [117]

Answer:

350mlliliters = 0.35liters

9liters = 9000milliliters

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2 years ago
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