What is the positive solution to this equation 4x^2+12x=135
1 answer:
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Let us calculate the area of the walk.
Since the width of the walk is 3 feet, and the walk will be placed all the 4 sides,
Length of the plot including walk = 20 + (2 × 3) = 20 + 6 = 26 feet.
Breadth of the plot including walk = 30 + (2 × 3) = 36 feet.
Area of the plot including walk = 26 × 36 square feet.
Area of the plot = 20 × 30 square feet.
Area of the walk = (26 × 36) - (20 × 30)
= 936 - 600
= 336 square feet.
= square yards
= 37.3 square yards
Cost of the walk per square yard = $12.25.
Therefore, total cost of the walk = 12.25 × 37.3 = $456.92.
Current value of the boat = $45000
Rate at which the value decrease = 8.5%
Value decreased after 1 year =
Hence, value becomes =
Value decreased after 2nd year =
Hence, value becomes =
Value decreased after 3 year =
Hence, value becomes =
So, value of the boat after 3 years becomes $34472.74
Using the relation between velocity, distance and time, it is found that his jogging rate was of 4.5 mph.
<h3>What is the relation between velocity, distance and time?</h3>Velocity is <u>distance divided by time,</u> hence:
Jogging, his velocity was of v, while the time was of t + 2, for a distance of 10 miles, hence:
Riding, his velocity was of 16, while the time was of t, also for a distance of 10 miles, hence:
Then, considering the first equation and replacing in the second:
16t² + 32t - 20 = 0 -> t = 0.5.
Then his jogging rate in mph was:
More can be learned about the relation between velocity, distance and time at brainly.com/question/24316569
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