3 years ago

PLEASE I REALLY NEED HELP ITS MY LAST QUESTION

Mathematics

1 answer:

ozzi3 years ago

4 0

$y = 5 \\ \times = 2.5$

You might be interested in

7 meters/20 minutes= x cm/2 hours

meriva

Answer:4,200

Step-by-step explanation:

4 0

3 years ago

Wich is greater 500 seconds or 8 minutes

ohaa [14]

500 seconds is greater. Since there are 60 seconds in one minute you would multiply 60 and 8.
60x8= 480

6 0

3 years ago

Read 2 more answers

1,000 darts were thrown at the rectangular board shown here. If 159 darts hit the circle, which of the following is most likely

Ludmilka [50]

The probability would be $\frac{159}{1000}$ ,
Simplify and turn into ratio.
0.159 : 1.

I am unsure what the full question was though.

Hope this helps.

7 0

3 years ago

A tank contains 100 gal of brine made by dissolving 80 Ib of salt in water. Pure water runs into the tank at the rate of 4 gal/m

ohaa [14]

Answer:

Step-by-step explanation:

Amount of brine = 100 gal

amount of salt = 80 lb

rate of water running = 4 gal / min

Let A be the amount of salt in lb in the tank at any time t.

(a) dA/dt = rate of salt in - rate of salt out

Rate of salt in = 0

rate of salt out = A x 4 / 100 = A / 25 lb/min

So, dA/dt = 0 - A/25 = - A/25 lb/min

$\frac{dA}{A}=-\frac{1}{25}dt$

$\int \frac{dA}{A}=-\frac{1}{25}\int dt$

$A(t) = C e^{-0.04t}$

When t = 0, A = 80 lb

So,

$A(t) = 80 e^{-0.04t}$

(b) Now, A = 40 lb

So,

$40 = 80 e^{-0.04t}$

$0.5 = e^{-0.04t}$

take log on both the sides

$ln 0.5 = - 0.04 t$

t = 17.3 minutes

8 0

3 years ago

Lucy's fish tank has 14 liters of water in it. She plans to add 5 liters per minute until the tank has at least 49 liters. What

Vikentia [17]

Answer:

Step-by-step explanation:

14 + 5t > = 49 (thats a greater then or equal sign)

5t > = 49 - 14

5t > = 35

t > = 35/5

t > = 7 <===

3 0

3 years ago