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Marianna [84]
3 years ago
7

Molly has 4x + $10 and Ron has 20 - 5 x dollars how much money do they have altogether and how much money does Molly have been R

on
Mathematics
2 answers:
Debora [2.8K]3 years ago
7 0
1. Do the opposite of addition (subtraction)

4x - 10 - (-5x + 20)

2. Change this equation (-5x - 20) into a positive (5x + 20)

4x - 10 + 5x - 20

9x - 10
pickupchik [31]3 years ago
6 0
Subtract them, just like you added: 
4x + 10 - (-5x +20) 
The minus turns (-5x + 20) into the opposite, or 5x - 20 
4x + 10 + 5x - 20 
9x - 10
I really hope this helps. 
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No.

Step-by-step explanation:

Waves are energy moving through the matter, but they leave the matter in the same place as they pass through.

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Help please. I attempted, but I couldn't succeed.
german

Answer:

y=(3/2)x+-14

First blank: 3

Second blank:2

Last blank:-14

Step-by-step explanation:

The line form being requested is slope-intercept form, y=mx+b where m is slope and b is y-intercept.

Also perpendicular lines have opposite reciprocal slopes so the slope of the line we are looking for is the opposite reciprocal of -2/3 which is 3/2.

So the equation so far is

y=(3/2)x+b.

We know this line goes through (x,y)=(4,-8).

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3 years ago
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A chemical flows into a storage tank at a rate of (180+3t) liters per minute, where t is the time in minutes and 0&lt;=t&lt;=60
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Answer:

The amount of the chemical flows into the tank during the firs 20 minutes is 4200 liters.

Step-by-step explanation:

Consider the provided information.

A chemical flows into a storage tank at a rate of (180+3t) liters per minute,

Let c(t) is the amount of chemical in the take at <em>t </em>time.

Now find the rate of change of chemical flow during the first 20 minutes.

\int\limits^{20}_{0} {c'(t)} \, dt =\int\limits^{20}_0 {(180+3t)} \, dt

\int\limits^{20}_{0} {c'(t)} \, dt =\left[180t+\dfrac{3}{2}t^2\right]^{20}_0

\int\limits^{20}_{0} {c'(t)} \, dt =3600+600

\int\limits^{20}_{0} {c'(t)} \, dt =4200

So, the amount of the chemical flows into the tank during the firs 20 minutes is 4200 liters.

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