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pogonyaev
3 years ago
14

Ten times a number decreased by seven equals 101 plus that number. Find the number

Mathematics
1 answer:
nadya68 [22]3 years ago
8 0
The number is twelve.
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3 years ago
Fill in the blank to make the statement true: -18 ___ -19 <br><br> &lt; <br><br>= <br><br>&gt;
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Answer: -18 > -19

Step-by-step explanation:

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2 years ago
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A man can row at 9km/h in still water. He rows 1.5km upstream and back again. The stream flows at 3km/h. What is his average spe
MrRa [10]

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

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8 0
2 years ago
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A forest fire is found at midnight. It covers 1200 acres then. It is spreading at a rate of f(t)= 5√t acres per hour. By how m
Eddi Din [679]

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)

3 0
3 years ago
A jet plane flies at 450 miles per hour. How far does it travel in 18 minutes
SVEN [57.7K]
<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.

4 0
3 years ago
Read 2 more answers
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