Answer:
d=-3.4
Step-by-step explanation:
d-4.2=-7.6
d=-7.6+4.2
d=-3.4
Your selections are correct, and the last one should be simplifying.
In one minute, there is 60 seconds. In one hour, there are 60 minutes, which have 60 seconds. Thus, in one hour there are 3,600 seconds (60 * 60). These values will come in handy.
First, let's convert the 3 hours into seconds. Since we know that 1 hour is equal to 3,600 seconds, we can say that 3 hours is equal to 10,800 seconds (3 * 3,600). Now, let's convert the 10 minutes. Since there are 60 seconds in 1 minute, we can say that there are 600 seconds in 10 minutes (60 * 10).
Together, these values add up to 11,400 seconds.
Probably $20 dollars because depending on how much the item cost 20% could only be worth $5 for example 20% off of an item that cost $60 is only $12
4+5x=1
subtract 4 from each side
5x=-3
divide both sides by 5
x = -3/5