The formula s=√18d can be used to find the speed s of a car in miles per hour when the car needs d feet to come to a complete stop after stepping on t

Chaya Galloway

Chaya Galloway

Answered question

2020-11-30

The formula s=18d can be used to find the speed s of a car in miles per hour when the car needs d feet to come to a complete stop after stepping on the brakes. If it took a car 25 feet to come to a complete stop after stepping on the brakes, estimate the speed of the car. Truncate the value of 18d, when d = 25, to the tenths place.

Answer & Explanation

liannemdh

liannemdh

Skilled2020-12-01Added 106 answers

Substitute d=25 to the formula and use a calculator to evaluate: s=18(25
s=450
s~21,2132...
Truncated to the tenths place, we have:
s~21.2 miles per hour.
Eliza Beth13

Eliza Beth13

Skilled2023-05-14Added 130 answers

1. Start by substituting the given value of d into the formula: s=18·25.
2. Simplify the expression inside the square root: s=450.
3. Evaluate the square root: s=450=21.2132034356 (approximated to the decimal places).
4. Truncate the value of s to the tenths place: s21.2.
Therefore, the estimated speed of the car is approximately 21.2 miles per hour.
madeleinejames20

madeleinejames20

Skilled2023-05-14Added 165 answers

Result:
21.2 miles per hour
Solution:
To estimate the speed of the car using the given formula, we substitute the value of d = 25 into the equation s=18d.
Substituting d = 25, we have:
s=18(25)
Simplifying the expression inside the square root:
s=450
To truncate the value to the tenths place, we round the square root of 450 to one decimal place. Therefore, the value of s is approximately 21.2 miles per hour.
Don Sumner

Don Sumner

Skilled2023-05-14Added 184 answers

To solve the given problem, we can substitute the value of d = 25 into the formula s=18d and estimate the value of s to the tenths place.
Let's start by substituting d = 25 into the formula:
s=18×25
Now, we can simplify the expression inside the square root:
s=450
To estimate the value of s to the tenths place, we need to find the square root of 450. Calculating it gives us:
s21.213
Truncating the value to the tenths place, we get:
s21.2
Therefore, the estimated speed of the car is 21.2 miles per hour.

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