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Bogdan [553]
3 years ago
12

The EPA standard for safe drinking water is a maximum of 1.3 milligrams of copper per liter of water. A water testing firm found

8.3 milligrams of copper in a 5-liter sample drawn from Jim and Sharon LeBlanc's
house. Is the water safe or not? By how much does the amount of copper exceed or fall short of the maximum allowed?

Is the water safe for drinking?

No
Yes
Mathematics
1 answer:
AnnyKZ [126]3 years ago
3 0
I think the answer is no
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Lisa wants to use her calculator to square a two-digit positive integer, but she accidentally enters the tens digit incorrectly.
Svetradugi [14.3K]

Answer: Correct two digit number= 24

Step-by-step explanation:

Let

x= tens digit (wrong one)

and y= zeroes digit

and z= tens digit (right one)

Now according to the statement,

(10x+y)² -  (10z+y)² = 2340

Simplifying this we get

(x-z)(5x+y+5z)= 117= 1 * 3 * 3 * 13

So it could either be

x-z=1 or x-z=3

If we take the x-z=1

then 5x+y+5z=117

which is not possible as maximum value we can get from this is 99.

This leaves us with x-z=3

so 5x+y+5z= 39

Put x=3+z

We get,

y+10z= 24

Now as y and z both are single digits so the only possible numbers to fit these are y=4 and z=2.

Put z=2 in x=3+z , we get x=5

So the numbers become 10x+y= 54

and 10z+y= 24

Their sum is 54+24=78

Check

54²-24²= 2340 so it is correct.

7 0
3 years ago
5x -6y=-32
erastovalidia [21]
So this question is already perfectly set up. Since the 6 and -6 cancel you’ll be left with 5x + 3x which is 8x and -32 + 48 which is 16. 8x=16. Isolate x to get that x=2. Plug 2 back into one of the equations. 5(2) -6y = -32. Solve for y now. -10-32 equals -42. Divide -42 by -6 to get 7. So the final coordinate where the two equations will intersect is (2,7)
3 0
2 years ago
What are the importance of knowing the theorems on midline, trapezoid and kite​
lutik1710 [3]

Answer:

It is important because it allows you to calculate the surface area of a trapezoidal prism

Step-by-step explanation:

7 0
3 years ago
What is -15x + 80 > 170
Korolek [52]

Answer:

Step-by-step explanation:

Value of x should be  less than (-6).

x = { .......,-9,-8,-7}

For example:

-15*-7 +80 = 105+80 = 185 >170

3 0
3 years ago
Howhowhow?how??? how would you calculate
Liula [17]

Ok sooooooooooo

Lets say your two fractions are

13/26 and 20/40

you can divide the bottom number by the top one and if you get the same answer for both then they are equivalent. For these you get 2 for both, which means they are equivalent.

another example would be if your fractions are

2/5 and 4/10

You can say well 2*2 equals 4 And 5*2 equals ten so these are equivalent fractions.

3 0
3 years ago
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