So they are asking to subtract, therefore it is 8.10-3.49=4.61 SO HE SPENT $4.61 Hope this helped!
Answer:
0.61 ( A )
Step-by-step explanation:
The standard proportion of Sugar, lemon juice and water needed to make a Lemonade is Usually 1 cup each
But If you Intend to make Your lemonade less sweet you can increase the water or reduce the amount of sugar to ≈ 1 ( i.e. less than 1 but approximately = 1 )
Hence The appropriate amount of sugar needed will be = 0.61
The simplified equation of
is 
<h3>How to determine the simplified equation?</h3>
The complete question is added as an attachment
The equation is given as

Subtract (x - 10)^2 from both sides

Evaluate 4^2

Take the square root of both sides

Add 6 to both sides

Hence, the simplified equation of
is 
Read more about simplified equation at:
brainly.com/question/723406
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I hope this helps you
6 (x^2+3x)=0
x (x+3)=0
x=0
x+3=0
x= -3