Answer:
10 ml of a 72% solution, 20 ml of a 54% solution
Step-by-step explanation:
x ml - amount of a 72% solution
y ml - amount of a 54% solution
(1)
(1) 2160-72y+54y=1800
y=20
x=30-y=30-20=10
Answer:
Try the first one I think and I remember when I did this one but I forgot the answer to this
You need to figure out how many hours does he need to read one book.
8.5 / 4 = 2.125
Hope this helps! (:
Answer:
Around 4000[since 979 close to 1000]
Step-by-step explanation:
4x979
=>3916
The roots are 1 +√7 and 1 -√7.
<h3>What is Quadratic equation?</h3>
A quadratic equation in the variable x is an equation of the form ax² + bx + c= 0, where a, b, c are real numbers, a≠0
Given equation:
y= x²+2x-6
First,
Half the coefficient of x and add and subtract the square of (b/2)
y= x²+2x-6+(1)²-(1)²
y= x²+2x+(1)² -6 -(1)²
y= (x+1)² -7
Now, equate y=0
(x+1)² -7 =0
(x+1)² = 7
x+1= ±√7
x=1 ±√7
Hence, the roots are 1 +√7 and 1 -√7.
Learn more about quadratic equation here:
brainly.com/question/1962219
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