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
Varvara68 [4.7K]
3 years ago
10

Need help on these easy questions

Mathematics
2 answers:
Romashka [77]3 years ago
8 0

I know that the answer to one of them is 2y

another is 10y+3

bogdanovich [222]3 years ago
5 0
2.
A) 8s (s = number of students)
B) 15 + 2s
C) method b because 15 + 2(10) = $35 while method a = 8(10) = $80

3.
A) 2c (c for # of cups)
B) 10p + 3
C) 35j - 10
You might be interested in
Need help ASAP 30 points and brainliest
shepuryov [24]

Answer:

Step-by-step explanation:

First equation

x + y ≥ 10

Second equation

5.50x + 3y ≤ 45

a possible soution can be

x = 4 and y= 6

7 0
3 years ago
Show work please.<br><br> solve system of equations using matrices.
nadya68 [22]

Answer:

(t, t -1, t)

Step-by-step explanation:

You have three unknowns but only 2 equations, so you can't really SOLVE this...you can get a solution with a variable still in it (I forget what this is called.  I think it refers to infinite many solutions).  Here's how it works:

Set up your matrix:

\left[\begin{array}{ccc}1&-2&1\\2&-1&-1\\\end{array}\right] \left[\begin{array}{ccc}2\\1\\\end{array}\right]

You want to change the number in position 21 (the 2 in the scond row) to a 0 so you have y and z left.  Do this by multiplying the top row by -2 then adding it to the second row to get that 2 to become a 0.  Multiplying in a -2 to the top row gives you:

\left[\begin{array}{ccc}-2&4&-2\\2&-1&-1\\\end{array}\right]\left[\begin{array}{ccc}-4\\1\\\end{array}\right]

Then add, keeping the first row the same and changing the second to reflect the addition:

\left[\begin{array}{ccc}-2&4&-2\\0&3&-3\\\end{array}\right] \left[\begin{array}{ccc}-4\\-3\\\end{array}\right]

The second equation is this now:

3y - 3z = -3.  Solving for y gives you y = z - 1.  Let's let z = t (some random real number that will make the system true.  Any number will work.  I'll show you at the end.  Just bear with me...)

lf z = t, and if y = z - 1, then y = t - 1.  So far we have that y = t - 1 and z = t.  Now we solve for x:

From the first equation in the original system,

x - 2y + z = 2.  Subbing in t - 1 for y and t for z:

x - 2(t - 1) + t = 2.  Simplify to get

x - 2t + 2 + t = 2  and  x - t = 0, and x = t.  So the solution set is (t, t - 1, t).  Picking a random value for t of, let's say 2, sub that in and make sure it works.  If:

x - 2y + z = 2, then t - 2(t - 1) + t = 2 becomes t - 2t + 2 + t = 2, and with t = 2, 2 - 2(2) + 2 + 2 = 2.    Check it:  2 - 4 + 4 = 2 and 2 = 2.  You could pick any value for t and it will work.

6 0
3 years ago
Image down below thx
damaskus [11]

Answer:

question 2 answer you wrote correct

question 3 answer is 20

3 0
2 years ago
Read 2 more answers
Please answer asap no trolls
Svetradugi [14.3K]

Answer:

It would probably be 15 actually

5 0
2 years ago
Read 2 more answers
Plot the image of point A under a reflection across line<br> l.
sergiy2304 [10]

Answer:

Just from point a go 8 spaces to the left and place the dot over there.

Step-by-step explanation:

Since you are getting a reflection of a you need to move 4 spaces to the left of the line to get an exact mirror of point a or relfelction.

4 0
2 years ago
Read 2 more answers
Other questions:
  • Mary has $500 in her account. she makes a $350 withdrawal, deposits $100, and then gets charged a $20 fee. how much does she hav
    5·2 answers
  • Solve the system by substitution
    7·2 answers
  • A probability distribution is a listing of all the outcomes of an experiment and the probability associated with each outcome. T
    14·1 answer
  • Renee solved a two-step equation to find x. First, she subtracted 11 from both sides. Then, she divided both sides by 4. Write a
    12·1 answer
  • Which term best describes the graph y= _____ 15 100 POINTS!!!
    7·1 answer
  • What is the best estimate of the sum of the fractions?
    7·1 answer
  • Shirts are on sale for $12 at a clothing store. How many shirts can you buy with $48?
    7·2 answers
  • Very confusing help i dont understand
    11·1 answer
  • Please can i have help
    7·2 answers
  • Can you match the teacher's comments to the definitions?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!