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2 years ago

Im trying to do IXL and I dont understand the way my teacher teaches (ironic right?)

Mathematics

2 answers:

RoseWind [281]2 years ago

6 0

Answer:

(8,-9)

Step-by-step explanation:

I used desmos to find your answer and got to finding the point using the slope. Sadly I can't link it for you

dlinn [17]2 years ago

4 0

Use the formula slope= y-y/x-x
-10-r/-2-8= 1/10
-10-r/-10= 1/10
Multiply the denominator (-10) on both sides
-10-r= -1
Add -10 to both sides
-r= 9
r= -9
Hope this helps!

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Help me please !!

Levart [38]

Answer:

Step-by-step explanation:

first 135

second 135 - 20% = 135 - 27 = 108

third 108 - 20% = 108 - 21.6 = 86.4

fourth 86.4 -20% = 86.4 -17.28= 69.12

rounded 69

7 0

3 years ago

A tank initially contains 60 gallons of brine, with 30 pounds of salt in solution. Pure water runs into the tank at 3 gallons pe

adoni [48]

Answer:

the amount of time until 23 pounds of salt remain in the tank is 0.088 minutes.

Step-by-step explanation:

The variation of the concentration of salt can be expressed as:

$\frac{dC}{dt}=Ci*Qi-Co*Qo$

being

C1: the concentration of salt in the inflow

Qi: the flow entering the tank

C2: the concentration leaving the tank (the same concentration that is in every part of the tank at that moment)

Qo: the flow going out of the tank.

With no salt in the inflow (C1=0), the equation can be reduced to

$\frac{dC}{dt}=-Co*Qo$

Rearranging the equation, it becomes

$\frac{dC}{C}=-Qo*dt$

Integrating both sides

$\int\frac{dC}{C}=\int-Qo*dt\\ln(\abs{C})+x1=-Qo*t+x2\\ln(\abs{C})=-Qo*t+x\\C=exp^{-Qo*t+x}$

It is known that the concentration at t=0 is 30 pounds in 60 gallons, so C(0) is 0.5 pounds/gallon.

$C(0)=exp^{-Qo*0+x}=0.5\\exp^{x} =0.5\\x=ln(0.5)=-0.693\\$

The final equation for the concentration of salt at any given time is

$C=exp^{-3*t-0.693}$

To answer how long it will be until there are 23 pounds of salt in the tank, we can use the last equation:

$C=exp^{-3*t-0.693}\\(23/60)=exp^{-3*t-0.693}\\ln(23/60)=-3*t-0.693\\t=-\frac{ln(23/60)+0.693}{3}=-\frac{-0.959+0.693}{3}= -\frac{-0.266}{3}=0.088$

5 0

3 years ago

en una fiesta se cómo aparte un pastel y al final solo quedan 2/5 del mismo ¿si Andrés se come 1/4 de lo que quedó que fracción

Morgarella [4.7K]

Answer: 2/125

Step-by-step explanation: No esto 100% seguro pero hice esto:

2/5 % 4 = 2/125

8 0

3 years ago

You are watching a game of poker on ESPN with your friends. You are trying to figure out the value of each colored chip that is

klasskru [66]

9514 1404 393

Answer:

N = 5; only one rate is possible

Step-by-step explanation:

The values of the sets of chips are ...

12 +9N +8N^2 +4N^3

and

2 +N +N^3 +N^4

We want to find N such that the difference in value is zero:

N^4 -3N^3 -8N^2 -8N -10 = 0

A graphing calculator can show us the roots. There is only one positive real root to this equation: N = 5.

The exchange rate N is 5. Only one rate is possible.

3 0

3 years ago

The secret number is grater than 75.<br>it has 9 tens.<br>it has a 3 in the ones places.

Vikki [24]

Answer:

The secret number is 93.

8 0

3 years ago