+ = positive
Positive and positive makes a positive
Negative and negative makes a positive
- = negative
Negative and positive makes a negative
Positive and negative makes a negative
Your answer: +5 - (-1) = 6
+6 - (-3) = +9
Your answer that youre looking for is: 9
Answer:
813 = 800 + 10 + 3 = (8 
) + ( 1
) + ( 3 
)
Step-by-step explanation:
i) 813 = 800 + 10 + 3 = (8 ) + ( 1 ) + ( 3 )
10% of the 50 were red.
10% * 50
(10/100) * 50
(1/10) * 50
= 5
5 were red.
The answers are: 4.5 g and 56.25 g respectively.
Since the first type of measurement in this question is weight or mass, I'll suppose that the percentage concentration is % mass/mass. For that type of concentration measurement, just multiply the percentage by the total mass to get the mass of the wanted material.
So 150 g * 3% = 150 g * 0.03 = 4.5g
For the 8% solution with the same amount of dry substance, use the ratio of percentages, multiplied by the mass of the first solution to get the wanted amount of new solution:
3/8 * 150 g = 56.35 g
