Answer:
<u><em>the answer is 225cm3</em></u>
9514 1404 393
Answer:
36
Step-by-step explanation:
Let the digits of the number be represented by t for the tens digit and u for the units digit.
u = 2t . . . . . . . . the units digit is twice the tens digit
2(10t +u) = (10u +t) +9 . . . . . double the number is 9 more than its reverse
Substituting for u, we have ...
2(10t +2t) = 10(2t) +t +9
24t = 21t +9 . . . . . . . . . . . collect terms
3t = 9 . . . . . . . . . . . . . subtract 21t
t = 3 . . . . . . . . . . . divide by 3
u = 2t = 6 . . . . find u
The number is 36.
If the submarine descended 184.4 meters in 23.5 minutes, its rate of descent was ...
... (184.4 m)/(23.5 min) ≈ 7.847 m/min
The submarine descended about 7.85 meters in one minute.
Substitute y = 1/5 x + 1 into x + 5y = -15
x + 5y = -15
x + 5(1/5 x + 1) = -15
x + x + 5 = -15
2x = -20
x = -10
Plug in x = -10 into y = 1/5 x + 1
y = 1/5 (-10) + 1
y = -2 + 1
y = -1
(-10 , -1)
Answer is the last one
(-10 , -1)
I hope this helps you
2x^2+5x+5=0
disctirminant =5^2-4.2.5
disctirminant = -15
x1= -5+i .square root of 15/2.2
x2= -5- i .square root of 15/2.2
