Can someone help me with this ASAP please I’m being timed !

Mathematics

1 answer:

denpristay [2]3 years ago

6 0

Answer:

The second option (choice b)

Step-by-step explanation:

At -1 is the line starts going up so its increasing. 2 shows that the line is starting to decrease so it would be between -1 and 1 where the line is increasing on the graph.

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Of the 2,500 tons of ore mined daily at a quarry, 0.4 percent results in a certain pure metal. In how many days of mining will t

mel-nik [20]

Answer:

250 days.

Step-by-step explanation:

Let x represent number of days.

We have been given that of the 2,500 tons of ore mined daily at a quarry, 0.4 percent results in a certain pure metal.

Let us find the amount of pure metal by calculating 0.4% of 2500.

$\text{Amount of pure metal}=2500\times \frac{0.4}{100}$

$\text{Amount of pure metal}=2500\times 0.004$

$\text{Amount of pure metal}=10$

Amount of pure metal mined in x days will be $10x$ .

Since we need total pure metal production equal to 2500 ton, so we can set an equation as:

$10x=2500$

$\frac{10x}{10}=\frac{2500}{10}$

$x=250$

Therefore, it will take 250 days of mining for the total amount of pure metal produced at the quarry to be equal to the daily amount of ore mined.

7 0

3 years ago

You have $23 comma 000 to invest, part at 8 % and the rest at 9 %. If x is the amount invested at 8 %, write an algebraic exp

Vinvika [58]

x = amount invested at 8 %. Then 23 000 - x = amount invested at 9 %

Annual income (I) = interest at 8 % + interest at 9 %

I = 0.08x + 0.09(23 000 – x)

I = 0.08x + 2070 – 0.09x

I = 2070 – 0.01x

3 0

3 years ago

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