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.

Question
Ratios, rates, proportions
asked 2020-11-30
The formula \(\displaystyle{s}=√{18}{d}\) 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 \(\displaystyle√{18}{d}\), when d = 25, to the tenths place.

Answers (1)

2020-12-01
Substitute d=25 to the formula and use a calculator to evaluate: \(\displaystyle{s}=\sqrt{{18}}{\left({25}\right.}\)
\(\displaystyle{s}=\sqrt{{450}}\)
s~21,2132...
Truncated to the tenths place, we have:
s~21.2 miles per hour.
0

Relevant Questions

asked 2020-12-22
A car traveling at a certain speed will travel 76 feet per second. How many miles will the car travel in 3.1 hours if it maintains the same speed? Round to the nearest tenth. (Hint: There are 5,280 feet in one mile)
asked 2021-02-12
Zalmon walks \(\displaystyle\frac{{3}}{{4}}\) of a mile in \(\displaystyle\frac{{3}}{{10}}\) of an hour. What is his speed on miles per hour?
a. 0.225 miles per hour
b. 2.3 miles per hour
c. 2.5 miles per hour
d. 2.6 miles per hour
asked 2020-11-12
the world record for 100m sprint was set by Usain Bolt in 2009 when he ran it in 9.58 seconds. How fast would this be in miles per hour?
asked 2021-02-18
Mr. Maxwell bought new basketball shows with the discount shown. He has a $10-off coupon he can use after the percentage off. If Mr. Maxwell bought the shows for $61.25, what was the original price?
A. If the shoes are discounted 25%, what percent of the original price is the original price?
25% discount is the same as □□% of the original price.
B. Fill in the boxes to set up the equation to find the original price of the shoes.
□□% ⋅⋅ Original Price −=61.25−=61.25
C. What would be the price without a $10-off coupon?
61.25+□=□61.25+□=□ $_____
asked 2020-11-12
Finance bonds/dividends/loans exercises, need help or formulas
Some of the exercises, calculating the Ri is clear, but then i got stuck:
A security pays a yearly dividend of 7€ during 5 years, and on the 5th year we could sell it at a price of 75€, market rate is 19%, risk free rate 2%, beta 1,8. What would be its price today? 2.1 And if its dividend growths 1,7% each year along these 5 years-what would be its price?
A security pays a constant dividend of 0,90€ during 5 years and thereafter will be sold at 10 €, market rate 18%, risk free rate 2,5%, beta 1,55, what would be its price today?
At what price have i purchased a security if i already made a 5€ profit, and this security pays dividends as follows: first year 1,50 €, second year 2,25€, third year 3,10€ and on the 3d year i will sell it for 18€. Market rate is 8%, risk free rate 0,90%, beta=2,3.
What is the original maturity (in months) for a ZCB, face value 2500€, required rate of return 16% EAR if we paid 700€ and we bought it 6 month after the issuance, and actually we made an instant profit of 58,97€
You'll need 10 Vespas for your Parcel Delivery Business. Each Vespa has a price of 2850€ fully equipped. Your bank is going to fund this operation with a 5 year loan, 12% nominal rate at the beginning, and after increasing 1% every year. You'll have 5 years to fully amortize this loan. You want tot make monthly installments. At what price should you sell it after 3 1/2 years to lose only 10% of the remaining debt.
asked 2020-12-28
Doug entered a canoe race. He rowed 3 \(\displaystyle\frac{{1}}{{2}}\) miles in \(\displaystyle\frac{{1}}{{2}}\) hour. What is his average speed in miles per hour?
asked 2021-02-21
Kaitlin knows that if she needs to add antifreeze to her car’s radiator the mixture used must contain 50% antifreeze and 50% water. How many gallons of a mixture containing 80% antifreeze must be added to a 3-gallon mixture containing 40% antifreeze to obtain the mixture Kaitlin needs?
asked 2020-12-09
Serena has job offers from two car dealerships. Classic Cars offers her a base salary of $22,000 per year plus an additional 1% commission on all sales she makes. Sweet Rides offers her a base salary of $13,000 per year plus an additional 2.5% commission on all sales she makes. Determine the amount of car sales in dollars for which both dealerships will pay Serena the same amount. Explain which offer Serena should accept based on the amount of car sales she expects to have.
asked 2021-01-13
Chase wants to earn at least $900 this month in commission. What is the minimum amount he needs to sell in order to earn $900 it he earns a 3.3% commission on everything he sells? Round to the nearest dollar.
asked 2020-10-27
the best floor company pruchases carpeting for 5.12 per square feet and marks it up 55% based on the selling price per square yard round to the nearest cent
...