1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
finlep [7]
3 years ago
13

What is (-a + b) (-c + d)?​

Mathematics
1 answer:
algol [13]3 years ago
4 0

Answer:

(−a+b)(−c+d)

=(−a+b)(−c+d)

=(−a)(−c)+(−a)(d)+(b)(−c)+(b)(d)

=ac−ad−bc+bd

You might be interested in
A tank contains 1600 L of pure water. Solution that contains 0.04 kg of sugar per liter enters the tank at the rate 2 L/min, and
goldfiish [28.3K]

Let S(t) denote the amount of sugar in the tank at time t. Sugar flows in at a rate of

(0.04 kg/L) * (2 L/min) = 0.08 kg/min = 8/100 kg/min

and flows out at a rate of

(S(t)/1600 kg/L) * (2 L/min) = S(t)/800 kg/min

Then the net flow rate is governed by the differential equation

\dfrac{\mathrm dS(t)}{\mathrm dt}=\dfrac8{100}-\dfrac{S(t)}{800}

Solve for S(t):

\dfrac{\mathrm dS(t)}{\mathrm dt}+\dfrac{S(t)}{800}=\dfrac8{100}

e^{t/800}\dfrac{\mathrm dS(t)}{\mathrm dt}+\dfrac{e^{t/800}}{800}S(t)=\dfrac8{100}e^{t/800}

The left side is the derivative of a product:

\dfrac{\mathrm d}{\mathrm dt}\left[e^{t/800}S(t)\right]=\dfrac8{100}e^{t/800}

Integrate both sides:

e^{t/800}S(t)=\displaystyle\frac8{100}\int e^{t/800}\,\mathrm dt

e^{t/800}S(t)=64e^{t/800}+C

S(t)=64+Ce^{-t/800}

There's no sugar in the water at the start, so (a) S(0) = 0, which gives

0=64+C\impleis C=-64

and so (b) the amount of sugar in the tank at time t is

S(t)=64\left(1-e^{-t/800}\right)

As t\to\infty, the exponential term vanishes and (c) the tank will eventually contain 64 kg of sugar.

7 0
4 years ago
Solve the system using any method.<br> 6x+2y =7<br> y= 2-3x
Drupady [299]

Answer:

there is no solution

3 0
3 years ago
Read 2 more answers
Determine the domain and range for t (x) = -(x +10)2 - 64
kirza4 [7]
Your answer would be x= -42

3 0
3 years ago
So i have an assignment that needs to be answered quickly please! :) So i need to know how to turn an improper fraction into a m
dezoksy [38]
Say if you have 55/10 thats an improper fraction so in order to turn that into a mixed number divide 55 by 10 which you will get 5. Something right so the 5 will be your whole number 5 then your leftover is 5 so you will put that 5 over 10 so the mixed number will be 5 5/10 but you can simplify that to 5 1/2
6 0
3 years ago
A satelite is 5,400 miles from the horizon of earth. Earths radius is about 4000 miles. Find the approximate distance the sateli
kakasveta [241]

Answer:

The distance of Satelite from the earth's surface = 2720.12 miles

Step-by-step explanation:

Below is the calculation for distance:

Use Pythagorean theorem

Distance, d² = 5400² + 4000²

d² = 45160000

d = 6720.12

Subtract the radius to find the distance from earth's surface.

Distance = 6720.12 - 4000 = 2720.12

The distance of Satelite from the earth's surface = 2720.12 miles

5 0
3 years ago
Other questions:
  • PLEASE HELP FAST!!!! River raft rental are $7 per hour plus a deposit fee of $25 per person. Wright a expression for the total c
    5·1 answer
  • Which number line correctly shows 0.8 + 0.3?​
    6·2 answers
  • What is the first step to 15-(-2)
    13·2 answers
  • A non-food crop is infected by pests on the 1st of a month. The pests infect the crop in such a way that the area infected doubl
    5·1 answer
  • Polygons ABCD and A′B′C′D′ are shown on the coordinate grid: A coordinate plane is shown with two polygons represented. Polygon
    14·2 answers
  • The ratio of boys to students is 3 to 7. If there are 20 girls in the school, then how many boys are in the school?
    11·1 answer
  • (x - 1)-+ x (1 - x)<br>-<br>-(1+x)<br>--x-1<br>is it correct?<br>​
    10·2 answers
  • Can you please help me with this
    5·2 answers
  • Show that the additive inverse or negative of an even number is an even number using a diret proof.​
    12·1 answer
  • Between which two consecutive numbers does the root of 90 lie
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!