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3 years ago

Which set of expressions are not equivalent?

Mathematics

2 answers:

mamaluj [8]3 years ago

7 0

3a+7+2a and 7a+5. These expressions are not equivalent. 5a+7 does not equal 7a+5.

PSYCHO15rus [73]3 years ago

7 0

3a + 7 + 2a and 7a + 5 are not equivalent

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maksim [4K]

Answer:

1-B, 2-B, 3-B, 4-B, 5-A

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2 years ago

A hubcap has a radius of 16 centimeters. What is the area of the hubcap? Round your answer to the nearest hundredth. Use 3.14 fo

Shtirlitz [24]

The formula for the area of a circle is pi*r^2. 3.14*16^2 = 803.84 centimeters squared

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2 years ago

You are wakeboarding on a river. You travel 2 miles downstream to a marina for supplies, and then you travel 3 miles upstream to

Zielflug [23.3K]

Let x represent the speed of of boat.

We have been given that the river current is 3 miles per hour.

The speed of boat upstream will be $x-3$ .

The speed of boat downstream would be $x+3$ .

$\text{Time}=\frac{\text{Distance}}{\text{Speed}}$

We have been given that you travel 2 miles downstream to a marina for supplies, and then you travel 3 miles upstream to a dock.

We can represent this information in an equation as:

$\text{Time}=\frac{2}{x+3}+\frac{3}{x-3}$

Since the speed of the boat is 18 miles per hour, so we will substitute $x=18$ in above equation and solve for time.

$\text{Time}=\frac{2}{18+3}+\frac{3}{18-3}$

$\text{Time}=\frac{2}{21}+\frac{3}{15}$

$\text{Time}=\frac{2}{21}+\frac{1}{5}$

$\text{Time}=\frac{2\cdot 5}{21\cdot 5}+\frac{1\cdot 21}{5\cdot 21}$

$\text{Time}=\frac{10}{105}+\frac{21}{105}$

$\text{Time}=\frac{31}{105}$

$\text{Time}=0.295238095$

Since time is in hours, so let us convert our given time in minutes.

1 hour = 60 minutes.

$\text{Time}=0.295238095\times 60\text{ minutes}$

$\text{Time}=17.7142857\text{ minutes}$

Rounding to nearest tenth of minute.

$\text{Time}\approx 17.7\text{ minutes}$

Therefore, it will take approximately 17.7 minutes for the boat to take the trip.

3 0

2 years ago

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Sauron [17]

Step-by-step explanation:

SEE THE IMAGE FOR SOLUTION ..

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2 years ago

Read 2 more answers

PLS HELP ME!!! I AM GIVING ALL MY POINTS OUT( look I don't have alot of points don't bully me(⌐■_■))

hodyreva [135]

Answer:

Step-by-step explanation:

3x3=9 +x=9x hope this helps

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3 years ago