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2 years ago

Can anyone help me with this please

Mathematics

2 answers:

Vikentia [17]2 years ago

4 0

Answer:

1. 3

2. 1

3. 9

4. 30

Step-by-step explanation:

1. 2*(18/12) = 3

2. 3*(5/15) = 1

3. 4*(45/20) = 9

4. 21*(10/7) = 30

navik [9.2K]2 years ago

4 0

Answer:

1. 2:x and 12:18

2. 2:15 and x:3

3. x:4 and 45:20

4. 21:x and 7:10

Step-by-step explanation:

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Answer:

0.255

Step-by-step explanation:

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3 years ago

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Althea paid $5.00 each for two bracelets and later sold each for $15.00. She paid $8.00 each for three bracelets

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3 years ago

A motorboat travels 172 km in 3 hours going upstream and 372 in 4 hours going downstream. What is the rate of the boat in still

torisob [31]

Answer:

<em>The rate of the boat is 75.17 km/h and the rate of the stream is 17.83 km/h</em>

Step-by-step explanation:

<u>System of Equations</u>

Let's call:

B = speed (rate) of the boat in still water

S = speed (rate) of the stream

The boat travels 172 km in 3 hours when going upstream, that is when the speed of the stream subtracts its own speed. The speed is the distance divided by the time, thus:

$\displaystyle B-S=\frac{172}{3}$

Multiplying by 3:

3B - 3S = 172 [1]

The boat travels 372 km in 4 hours downstream when the speed of the current adds to its own:

$\displaystyle B+S=\frac{372}{4}=93$

B + S = 93

Solving for B:

B = 93 - S [2]

Substituting in [1]

3(93 - S) - 3S = 172

Operating:

279 - 3S - 3S = 172

279 - 6S = 172

Subtracting 279:

- 6S = 172 - 279

- 6S = -107

Multiplying by -1 and solving for S:

$S = \frac{107}{6}\approx 17.83\ km/h$

From [2]:

$B = 93 - \frac{107}{6}$

$B=\frac{451}{6}\approx 75.17\ km/h$

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3 years ago

PLEASE HELP THIS IS TIMED WILL GIVE BRAINLIEST

Elodia [21]

Answer:Ok, we have:

d(t) = 3*t^2 + 5*t - 2.

The first interval is:

(2, 3)

and remember that, for an interval (a,b), the difference quotient is:

D = (f(b) - f(a))/(b -a)

Then in this first interval we have:

So the average rate of change in (2,3) is 20.

now, in (2, 2.5) we have:

So here the rate of change is 9.25

And in the interval (2, 2.1) we have:

So in this interval the rate of change is 1.73

Step-by-step explanation: hope this helps luvv

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