2.0612439*10^7 should be your answer
Answer:
81
Step-by-step explanation:
2x+6=84
2x=78
81
find your own way
Answer:
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Answer:
A is the correct answer.
Step-by-step explanation:
Multiplying something by a fraction is the same as dividing something by the denominator of that fraction, so that makes it simplified to 67 ÷ 6.
67 ÷ 6 is definitely less than 67 but because it is equal to 11.16, it is not between 0 and 1. It is also not greater than 67 or equal to 67, so using the process of elimination, we have found the answer.
Hope this answer helped!
We can use these variables:
A = number of ounces for solution A
B = Number of ounces for solution B
A + B = 20
Now, we can use decimal conversions.
0.65A + 0.80B = 0.70(120)
Next step: We substitute A into 120 - B to show their relationship.
0.65(120 - B) + 0.80B = 84
Now onto the next equation:
78 - 0.65B + 0.80B = 84
0.80 - 0.65 = 0.15, so…
0.15B = 84 - 78
0.15B = 6
B = 6 divided by 0.15
B = 40 ounces
To find A, we can simply plug B into the starting equation.
A = 120 - 40
A = 60 ounces
Your final answer: The scientist should use 60 ounces of solution A and she should use 40 ounces of solution B. Yeah