Answer:
7.5 minutes
Step-by-step explanation:
If we let x represent the number of minutes it takes for the cold faucet to fill the tub, then it takes 2x minutes for the hot faucet. The total rate of filling in tubs per minute is ...
1/x + 1/(2x) = 1/5
Multiplying by 10x, we have ...
10 + 5 = 2x
x = 15/2 = 7.5
It takes the cold faucet 7.5 minutes to fill the tub.
975 ÷7.5 = 130 cu ft
2130 - 130 = 2000
2000 ÷ 20 = 100 min
Answer:
tan R= 45/28
tan S= 28/45
Step-by-step explanation:
tan R = TS/RT= 45/28
tanS = RT/TS= 28/45
X = number of lessons, y = total cost
y = 15x + 20 <== ur equation
when total bill was 125...y = 125
125 = 15x + 20
125 - 20 = 15x
105 = 15x
105/15 = x
7 = x <=== if Bill took 7 lessons, it would cost 125 <==
So multiply .0001 by 4,000,000,000,000.
so use the decimal thing 1st.
so 1*4,000,000,000, and thats ur answer