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sasho [114]
3 years ago
11

A car moves with an average speed of 45 miles/hour. How long does the car take to travel 90 miles?

Mathematics
2 answers:
Tatiana [17]3 years ago
7 0
The car takes 2 hours to travel 90 miles

disa [49]3 years ago
5 0
<h3><u>Answer;</u></h3>

<em>= 2 hours </em>

<h3>Solution;</h3>

Speed is the distance covered by a moving body per unit time.

Thus, speed = distance/time

Therefore; time will be given by distance divided by time

Hence; time =Distance/time

           distance = 90 miles

           speed = 45 miles/hour

Time = 90 miles/45 miles/hour

        = 2 hours

Therefore, a time of two hours is taken by the car to travel 90 miles when moving at a speed of 45 miles/hour.

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The perimeter of the triangle is 42. Find the length of all the sides.
iragen [17]
<h3>Given :-</h3>

  • Perimeter of triangle = 42

  • Side 1 of triangle = (x + 4)

  • Side 2 of triangle = (3x + 8)

  • Side 3 of triangle = (5x + 6)

<h3>To find:-</h3>

  • Length of sides

<h3>Explanation:</h3>

So to find length of sides we have to find the value of x.We can find value of x , by this formula:

\\  \\

\bigstar \boxed{ \rm perimeter \: of \triangle \:  = side_1 + side_2 + side_3}

\\  \\

So:-

\\

\dashrightarrow \tt perimeter \: of \triangle \:  = side_1 + side_2 + side_3 \\

\\  \\

\dashrightarrow \tt 42  = (x + 4) + (3x + 8)+( 5x + 6) \\

\\  \\

\dashrightarrow \tt 42  = x + 4+ 3x + 8+5x + 6 \\

\\  \\

\dashrightarrow \tt 42  = x + 3x+5x+ 4 + 8 + 6 \\

\\  \\

\dashrightarrow \tt 42  = 9x+ 4 + 8 + 6 \\

\\  \\

\dashrightarrow \tt 42  = 9x+ 18\\

\\  \\

\dashrightarrow \tt 42  - 18 = 9x \\

\\  \\

\dashrightarrow \tt 24 = 9x \\

\\  \\

\dashrightarrow \tt  9x = 24 \\

\\  \\

\dashrightarrow \tt  x = \dfrac{24}{9}  \\

\\  \\

\dashrightarrow \bf  x =2.67 \{approx \}\\

\\  \\

  • Side 1 of triangle = (x + 4)
  • Side 1 of triangle =2.67 + 4
  • Side 1 of triangle = 6.67

  • Side 2 of triangle = 3x + 8
  • Side 2 of triangle = 3 × 6.67 + 8
  • Side 2 of triangle = 20.01 + 8
  • Side 2 of triangle = 28.01

  • Side 3 of triangle = 5x + 6
  • Side 3 of triangle = 5 × 2.67 + 6
  • Side 3 of triangle = 13.35 + 6
  • Side 3 of triangle = 19.35

━━━━━━━━━━━━━━━━

~WindyMint

3 0
2 years ago
The area of a parallelogram is 31.5 ft and the height is 6.3 ft. What is the length of the base?
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The base is 5 because when you divide 31.5 by 6.3 it's 5
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gallons of water can fill a pool that is 50 yards by 20 yards and is 9 feet deep? (Assume 7 1/2 gallons per cubic foot.)
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30% in simplest form
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Answer:

I think it's 3/10

Step-by-step explanation:

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The answer is D. Hope this helps!

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