3 years ago

Which of the following answer choices shows the correct way to balance this reaction: Fe + O₂ → Fe₂O₃

Mathematics

1 answer:

ira [324]3 years ago

8 0

I think the answer is Fe+02=fe 203

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An inlet pipe on a swimming pool can be used to fill the pool in 40 hours. The drain pipe can be used to empty the pool in 42 ho

statuscvo [17]

Answer:

Pool will be filled in 280 hours

Step-by-step explanation:

Inlet pipe fills in 40 hours = 1 pool

Inlet pipe fills in 1 hours = $\frac{1}{40}$

Drain pipe empty in 42 hours = 1 pool

Drain pipe empty in 1 hour = $\frac{1}{42}$

If both pipes are opened together

then in pool fills in 1 hour = $\frac{1}{40}$ - $\frac{1}{42}$

on simplifying the right side ,we get $\frac{42-40}{(40)(42)}$

= $\frac{2}{(40)(42)}$

= $\frac{1}{840}$

$\frac{1}{840}$ pool fills in 1 hour

1 pool will be filled in 840 hours

$\frac{2}{3}$ pool is filled

empty pool = 1 - $\frac{2}{3}$ = $\frac{1}{3}$

therfore $\frac{1}{3}$ pool will be filled in $\frac{1}{3}$ X 840 =

= 280 hours

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3 years ago

Which of the following sequences is not geometric

FrozenT [24]

Third one I think 10,20,30,40

4 0

3 years ago

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Combine like terms and write 4y+5y^2-6-5y+27-1y^2 in standard form

miv72 [106K]

Answer:

4y^2 - y + 21

5 0

3 years ago

HELP ASAP Solve log7 b > 2. Question 18 options: b > 7 b > 49 b > 2–7 b > 14

labwork [276]

Answer: Second Option

$b > 49$

Step-by-step explanation:

We have the following expression:

$log_7(b) > 2$

We have the following expression:

To solve the expression, apply the inverse of $log_7$ on both sides of the equality.

Remember that: $b ^ {log_b (x)} = x$

So we have to:

$7^{log_7(b)} > 7^2$

$b > 7^2$

$b > 49$

The answer is the second option

3 0

4 years ago

Using slope formula find the slope of the line through the points 0,0 and 3,12 use the pencil and paper

sertanlavr [38]

Answer:

wouldn't it be 3,12.....................

7 0

3 years ago

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