I have actually, but all I did was block the number, as I was not aware that they had any of my details.
Answer: -18 > -19
Step-by-step explanation:
Answer: average speed is 8 km/h
Step-by-step explanation: in upstream his speed is 9 km/h -3km/h.
So his speed is 6km/h and he needs time t= s/v= 1.5 km: 6 km/h = 0.25 h
Downstream his speed is 9 km/ + 3km/h = 12km/h and time is
1.5 km:12km/h= 1/8 hours= 0.125 h
Average speed v = s/t = 3km: (0.25 + 0.125 ) h = 8 km/h
Answer:
49 acres
Step-by-step explanation:
Given that:
Initial coverage = 1200 at midnight
Spread rate = 5√t acres per hour
By how many acres will the fire grow between 6am and 10 am
Hours between (6 - 10) am = 6 hours
Take the integral of the rate function with upper limit = 6 and lower limit = 0
∫5√t dt at t = 6, t = 0
5∫√tdt = 5∫t^1/2 dt at t = 6, t = 0
5 (t^1/2 + 1 / 1/2 + 1) at t = 6, t = 0
5 ( t^3/2 / 3/2) at t = 6, t = 0
5 * 2/3 (t^3/2)
[10/3 *t^3/2] at t = 6, t = 0
(10/3 * 6^3/2) - (10/3 * 0^3/2)
(10/3 * 14.696938) - 0
48.989794
= 49 acres ( approximately)
<h3><u>How to solve this problem?</u></h3>
The way I would solve this problem is by first finding the unit rate, or the rate that the jet plane travels in one minute. Then I would multiply the rate by the number of minutes I want to know how far the jet plane flies; in this case it would be multiplied by 18 minutes.
<h3><u>Finding the unit rate.</u></h3>
Let's start by finding the unit rate. To find the unit rate we would divide the ratio, 450 miles:60 minutes (one hour) by 60 minutes to make the 60 minutes become one minute and 450 miles become 7.5 miles.
450 miles:60 minutes ÷ 60/60
7.5 miles:1 minute
<h3><u>Solving the question.</u></h3>
The unit rate is 7.5 miles per minute. Since we know the jet plane flies 7.5 miles every one minute, we can multiply this amount by 18 minutes to find how many miles the place can fly in 18 minutes.
7.5 miles * 18 minutes = 135 miles
The answer to your question is the jet plane travels 135 miles in 18 minutes.
