To answer the question, let x be the number of pounds of coffee worth $9. Having said that, the number of pounds of coffee worth $3 is 120 - x. The equation relating the items before and after mixing is,
(x)($9) + (120 - x)($3) = (120)($5)
The value of x is 40. Therefore, the amount of coffee worth $9 and $3 to be used are 40 and 80 pounds, respectively.
Answer:
i dunno if im late but it should be -20 sorry if im wrong
Step-by-step explanation:
Answer:
100
Step-by-step explanation:
Answer: Luis’s first step was incorrect, because he flipped the inequality sign when he subtracted
Step-by-step explanation:
Given: Amelia, Luis, Shauna, and Clarence used different approaches to solve the inequality
7.2b + 6.5 > 4.8b – 8.1.
If Luis started by subtracting 4.8b from both sides ,then he would get
7.2b + 6.5 - 4.8b> 4.8b – 8.1- 4.8b
⇒2.4b + 6.5 > – 8.1. But he wrote 2.4b + 6.5 < – 8.1 by flipping the inequality sign which was not correct .
The sign of inequality get flipped if we multiply or divide a negative numbers to the both sides .
Therefore, Luis’s first step was incorrect, because he flipped the inequality sign when he subtracted.
