Given that <span>Jack rakes the yard in 5 hours and Jill rakes the yeard in 8 hours. Let the amount of time that it takes them to rake the yard together be t, then:

$\frac{1}{t} = \frac{1}{5} + \frac{1}{8} \\ \\ = \frac{8+5}{40} = \frac{13}{40} \\ \\ \therefore t= \frac{40}{13} =3 \frac{1}{13}\ hours$ </span>

8 0

3 years ago

4 +y = 12. Substitute 8 for x.

Alexeev081 [22]

Answer:

where should I substitute 8 for x? if its like this 4(8)+y=12 than its y=-20

Step-by-step explanation:

8 0

3 years ago

I need help please!!

Alex73 [517]

Answer:

Sorry I could only find the answer to the second part.

y=56x

6 0

2 years ago