( * = multiplication/multiply/times )
Let x - liters of 10% acid solution needed
4-x = liters of 4% acid solution needed
.1x + .04*(4-x)
-------------------- = .07
4
.1x + .04*(4-x) = 4*.07
.1x + .16 - .04x = .28
.06x = .12
x=2
4-x=2
2 liters of 10% acid solution are needed
2 liters of 4% acid solution are needed
If you're still uncertain, we can check our work as so:
.1x + .04*(4-x)
--------------------- = .07
4
.1 * 2 + .04 * (4-2)
------------------------ = .07
4
.2 + .08
------------ = .07
4
.28 = .07 * 4
.28 = .28
Hope I helped.
9514 1404 393
Answer:
False
Step-by-step explanation:
The terms of a geometric series would have a common ratio. The terms of this series do not. (The differences increase by 1 each time, so it is a quadratic series.)
False, the series is not geometric.
Answer:
4.875 = s
Step-by-step explanation:
3.5=12s-55
Add 55 to each side
3.5+55=12s-55+55
58.5 = 12s
Divide each side by 12
58.5/12 = 12s/12
4.875 = s
Answer:181.3ft
Step-by-step explanation:
sin (65) = opp/200
200 sin (65) = opp
ans: 181.3ft
Answer:
- 1.25 hours or 1 hour and 15 minutes
Step-by-step explanation:
<em>Question</em>
- <em>Lisa lit a candle with a height of 8 inches. When lit, this candle loses 10% of its original height every hour. </em>
- <em>Please complete the following sentence by writing the number in the blank.
Until the candle has been burning for at least _______ hours, the height of Jennifer's candle will be more than 7 inches.</em>
<u>Candle looses 10% of 8 inches, it equals:</u>
- 8*0.1 = 0.8 inches an hour
<u>Let x be required time, then:</u>
- 8 - 0.8x > 7
- 0.8x < 8 - 7
- 0.8x < 1
- x < 1/0.8
- x < 1.25
- or 1 hour 15 minutes
