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3 years ago

Use your knowledge about parentheses and substitution to solve the following:

Mathematics

2 answers:

SVETLANKA909090 [29]3 years ago

7 0

Answer:

3x+y

=−3

=−y+3

3x+y

3(−y+3)+y

−3y+9+y

−2y

=−3

=−12

Step-by-step explanation:

Hope this helps!

sergejj [24]3 years ago

4 0

Answer:

what grade you in

your answer 3x+y

Step-by-step explanation:

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Jesse and her brothers nick and owen are saving money over the summer each week, jesse saves twice as much as owen. Owen saves $

Harrizon [31]

If how much owen saves is x, 2x=y (jessie's amount of saved money) and
x-5=nick's amount of money =z

Since x+y+z=220, we plug 2x in for y and x-5 in for z, getting x+2x+x-5=220. Adding 5 to both sides, we get 4x=225 and by dividing by 4 we get x=225/4=61.25 dollars. 61.25-5=56.25=z=nick's money, and 61.25*2=122.5=jessie's saved money

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4 years ago

A bus travels 18 miless in 15 min. at the same rate ,what distance will the bus travel in 50 minutes

Damm [24]

Answer:

60 miles in 50 minutes

Step-by-step explanation:

(18 miles/ 15 mins)* 50 minutes= answer

1.2 * 50

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3 years ago

Sales tax in your community is 5. 25 cents for each dollar spent. What is the total cost at the movies for three tickets at

Montano1993 [528]

Answer:

33.94

Explanation:

First start off by finding the total regardless of the 5.25 cents.

(3x8.50)+(3x1.25)+(2x1.50)=32.25

Then take that answer and multiply by your 5.25 cents per dollar

32.25x.0525 (since we're dealing with money)

then add that answer to the original 32.25

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2 years ago

Multiply (-4)(-2)(-5).<br> -40<br> -8<br> 08<br> 40

amid [387]

Answer:

Step-by-step explanation:

$(-4)(-2)(-5)\\\\\mathrm{Remove\:parentheses}:\\\quad \left(-a\right)=-a,\:-\left(-a\right)=a\\\\=-4\times\:2\times\:5\\\\=-40$

4 0

3 years ago

Read 2 more answers

Suppose that vehicles taking a particular freeway exit can turn right (R), turn left (L), or go straight (S). Consider observing

Kazeer [188]

Answer:

a. A = {RRR,LLL,SSS}

b. B = {RLS, RSL, LSR, LRS, SRL, SLR}

c. C = {RRS, RRL, RSR, RLR, LRR, SRR}

d. D = {RRS, RRL, RSR, RLR, LRR, SRR, SSR, SSL, SRS, SLS, LSS, RSS, LLS, LLR, LRL, LSL, SLL, RLL}

e. C U D= {RRS, RRL, RSR, RLR, LRR, SRR, SSR, SSL, SRS, SLS, LSS, RSS, LLS, LLR, LRL, LSL, SLL, RLL}

C n D = {RRS, RRL, RSR, RLR, LRR, SRR}

Step-by-step explanation:

a..

All three vehicles go in the same direction

This means that all the three vehicles either go straight, or right or left at the same time.

So, A { {RRR, LLL, SSS}

b..

All three vehicles take different directions

Thus means that all the vehicle take different routes

If a vehicle takes the the straight direction, the other 2 vehicles take right and left directions respectively

So, B = {RLS, RSL, LSR, LRS, SRL, SLR}

c..

Exactly two of the three vehicles turn right

This means that two vehicles take right direction while the last vehicle either tske the straight route or left route.

C = {RRS, RRL, RSR, RLR, LRR, SRR}

d..

Exactly two vehicles go in the same direction.

The means that if two vehicles pass straight direction then the third vehicle takes either the right or left direction.

Also, if two vehicles pass right direction, the third vehicle either takes the left direction or straight direction

Lastly, if two vehicles pass left direction then the third vehicle either pass the straight direction or right direction.

D = {RRS, RRL, RSR, RLR, LRR, SRR, SSR, SSL, SRS, SLS, LSS, RSS, LLS, LLR, LRL, LSL, SLL, RLL}

e. C U D = the union of items in C and D without repetition

So,

C U D= {RRS, RRL, RSR, RLR, LRR, SRR, SSR, SSL, SRS, SLS, LSS, RSS, LLS, LLR, LRL, LSL, SLL, RLL}

C n D = Common items in C and D

C n D = {RRS, RRL, RSR, RLR, LRR, SRR}

List outcomes in D'.D' = List outcomes in C ∪ D.C ∪ D = List outcomes in C ∩ D.C ∩ D =

3 0

4 years ago