Answer:
John should use:
4 grams of the 30% solution and 16 grams of the 60% solution
Step-by-step explanation:
Let the number of grams of the 30% solution = x
Let the number of grams of the 60% solution = y
John needs 20 grams of 54% acid solution for his science project.
Hence,
x + y = 20 grams..... Equation 1
x = 20 - y
His school's science lab has bottles of 30% solution and bottles of 60% solution.
30% × x + 60% × y = 54% × 20
0.3x + 0.6y = 10.8......Equation 2
We substitute 20 - y for x in Equation 2
0.3(20 - y) + 0.6y = 10.8
6 - 0.3y + 0.6y = 10.8
- 0.3y + 0.6y = 10.8 - 6
0.3y = 4.8
y = 4.8/3
y = 16 grams
x = 20 - y
x = 20 - 16
x = 4 grams
Therefore, John should use:
4 grams of the 30% solution and 16 grams of the 60% solution
Answer:
The remaining area of the circle is 196.06 cm².
Step-by-step explanation:
<em>(area of circle) - (area of triangle)</em><em> </em><em>=</em><em> </em><em>remaining</em><em> </em><em>area </em><em>of </em><em>the </em><em>circle</em>
<em>πr² - ½bh</em>
<em>3.14(8)² - ½(3)(4)</em>
<em>3.14(64) - ½(12)</em>
<em>202.06 - 6</em>
<em>= 196.06</em>
The answer is A, let me know if you need an explanation
Answer:
I think the answer is B(3,4).
Step-by-step explanation:
It is that answer because that answer is the only one that stops with and x factor and a y factor.
