7kg of lead can safely be dissolved in 1000 kg of water.
<h3>What is ppm ?</h3>
It is a unit of measurement of concentration , also known as parts per million.
Amount of solute in 1 million parts of solution
1ppm = 1mg/kg
The maximum permitted level is 7ppm
This means 7mg /kg
For 1000 kg of water = 7000mg lead = 7kg of lead is permissible.
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1 yard = 3 feet
The foundation is 2/3 yard wide, by 1 yard deep by 10 yards long.
Volume is Length x width x height.
Volume = 2/3 x 1 x 10 = 6.66 cubic yards.
The answer is B.
Answer:
<R = 158
Step-by-step explanation:
Supplementary angles equal 180 degrees.
<Q + <R =180
22 + <R = 180
Subtract 22 from each side
22-22 + <R = 180-22
R = 158
2. just do inverse transformation to get pre-image. simply do T(4,-3) to given vertices.
you'll get A(-1,1)B(7,1)C(7,-2)D(-1,-2)
5. dont know.
10.option 1 and 4
In order to subtract mixed fractions, we must convert them into improper fractions first. To do this simply multiply the whole number by the denominator and add the numerator. The product of this operation will be the new numerator (the whole number is no longer present).
(56 + 7)/8 - (12 + 1)/4
= 63/8 - 13/4
Now that we have our fractions in improper form, we must find the least common denominator which is 8. To avoid changing the value of the second fraction, multiply both the numerator and denominator by 2 (which is essentially 2/2 which equals to 1).
63/8 - 26/8
= 37/8