$- 1 | \frac{2}{3} - 4| \div \frac{5}{6} \\ - 1 | \frac{2}{3} - \frac{4 \times 3}{1 \times 3} | \div \frac{5}{6} \\ - 1 | \frac{2 - 12}{3} | \div \frac{5}{6} \\ - 1 | \frac{ - 10}{3} | \div \frac{5}{6} \\ \frac{10}{3} \div \frac{5}{6} \\ \frac{10}{3} \times \frac{6}{5} \\ \frac{2}{1} \times \frac{2}{1} = 4$

3 0

2 years ago

a copy machine can copy a report in 30 min. when a second copy machine is used at the same time, the copying can be done in 18 m

Marta_Voda [28]

Answer:

Step-by-step explanation:

A copy machine can copy a report in 30 mins. When a second copy machine is used at the same time, the copying can be sone in 18 min. How long would it take the second copu machine to do the copying alone?

i have:

x=30

x+y=18

that would be -12..not right?

4 0

2 years ago

I'm confused about this question

lesantik [10]

Answer:

the answer is 3

Step-by-step explanation:

4 0

3 years ago

This equation has one solution.<br> 5(r–1) + 3r =7(r + 1)<br> What is the solution?

Nadusha1986 [10]

Answer:

R=12 is the solution

I don't know how to explain but it needs to be 20 characters

4 0

3 years ago