Answer:
f(4)=-2
Step-by-step explanation:
f(4)=-4+2=-2
Answer: im not sure
Step-by-step explanation:
I have no clue what to answer 9
Answer:
Step-by-step explanation:
We can let the 'number' in the expression be equal to 
. Something 6 less than x would x minus 6, or .
Answers:
She made ___25___ grams of ___40___% salt solution
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The given info "20 grams of 50% salt solution" tells us that we have 10 grams of pure salt
Since 50% of 20 = 0.50*20 = 10
Put another way, we have 10 grams of pure salt out of 20 total so 10/20 = 0.50 = 50% salt solution
The 20 grams of solution updates to 25 grams of solution when we add the 5 grams of water
We don't add any salt, assuming this water is fresh water
So we still have 10 grams of pure salt out of 25 grams now
10/25 = 2/5 = 0.40 = 40% is the new salt concentration
