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4 years ago

12

If Roberto does a job in 11 hours and with the help of Sarah they can do it together in 2 hours, how long would it take Sarah to

do it alone?

1 answer:

Levart [38]4 years ago

3 0

I think it is seven but im probaly wrong

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Initially, 50 pounds of salt are dissolved in a large tank holding 300 gallons of water. A brine solution with a concentration o

kirill [66]

Answer:

dA / dt = 6 - A (t) / 100

600

Step-by-step explanation:

We have to:

dA / dt = In - Out

Input = input salt concentration * input rate of brine

replacing

Inlet = 2 lb / gal * 3 gal / min = 6 lb / min

there is no build up because the inlet flow equals the outlet, so there are 300 gallons in the tank at the start

Output: salt concentration at the output * output rate of brine

replacing

Output: A (t) / 300 * 3 gal / min = A (t) / 100

Thus:

dA / dt = 6 - A (t) / 100

this would be the differential equation.

now, when time tends to infinity, we would be left with:

100 * dA / dt = 600 - A (t)

When t tends to infinity, A (t) tends to 0, therefore, the amount of salt would be 600.

4 0

3 years ago

Simplify the expression<br> 65-4^2 (10-2)+37 <br> please show all work

BartSMP [9]

Hello there!

$65-4^2 (10-2)+37 \\$

Explanation:

↓↓↓↓↓↓↓↓↓↓↓↓↓

I gave you a hint.

You had to used PEMDAS.

P-Parenthesis

E-Exponents

M-Multiply

D-Divide

A-Add

S-Subtract

First you had to calculate with parenthesis first.

$65-4^2(10-2)+37$

$65-4^2*8+37$

Then you calculate with exponents.

$4^2=4*4=16$

$65-16*8+37$

You had to multiply and divide you had go to left to right.

$16*8=128$

$65-128+37$

Then you add or subtract you had go to left to right.

$65-128+37=-26$

$=-26$

Answer⇒⇒⇒⇒⇒⇒=-26

Hope this helps!

Thank you for posting your question at here on Brainly.

Have a great day!

-Charlie

6 0

3 years ago

Help!!!!!!!!!!!!!!!!!

andrew-mc [135]

Answer:

Proportional

Step-by-step explanation: Its proportional because it is a straight line, and the line starts at 0, which is the point of origin.

6 0

3 years ago

Natalie saved $20 when she purchased a new phone. The phone originally cost $125. What percent savings did Natalie receive on th

Free_Kalibri [48]

15% I think, I’m pretty sure I’m right

6 0

3 years ago

The area of a rectangular patio is 9 5/8 square meters. The width of the patio is 2 3/4 meters. What is the length? Enter your a

Oduvanchick [21]

Answer:

3 1/2 meters

Step-by-step explanation:

A = LW

9 5/8 = L x 2 3/4

L = 9 5/8 / 2 3/4 = 77/8 / 11/4 = 77 x 4 / 8 x 11 = 7/2 = 3 1/2

5 0

3 years ago

Read 2 more answers