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
Temka [501]
2 years ago
9

Hi, I need help.

Mathematics
2 answers:
slavikrds [6]2 years ago
7 0

Answer:

B, 24 (second answer choice)

Step-by-step explanation:

4r+7s=23

r-2s=17

8r+14s=46

7r-14s=119

15r=165

r=11

11-2s=17..........by putting value of r in ii

-2s=17-11

2s= -6

s= -3

3r+3s=3*11+3(-3) you get this by putting values of r and s

       =33-9

       =24    (B)

SpyIntel [72]2 years ago
3 0
<h3>Answer:  B) 24</h3>

============================================================

Explanation:

Add the left hand sides of the two equations to get (4r+7s)+(r-2s) = 5r+5s

Do the same for the right hand sides of the two equations 23+17 = 40

After adding the equations, we end up with 5r+5s = 40 which is the same as 5(r+s) = 40

Next, divide both sides by 5 to lead to r+s = 8

Finally, multiply both sides by 3 to end up with 3(r+s) = 24 which is the same as 3r+3s = 24

----------------------------

An alternative is to solve r-2s = 17 for r to get r = 2s+17. Then plug this into 4r+7s = 23 getting 4(2s+17)+7s = 23. This solves to...

4(2s+17)+7s = 23

8s+68+7s = 23

15s+68 = 23

15s = 23-68

15s = -45

s = -45/15

s = -3

Which means,

r = 2s+17

r = 2(-3)+17

r = 11

and therefore,

3r+3s = 3(-3)+3(11) = -9+33 = 24

You might be interested in
What's the numerator for the following rational<br> expression?<br> j/k + 1/k = ?/k
lys-0071 [83]

Answer:

j+1

Step-by-step explanation:

j/k + 1/k = ?/k

Since the denominator is the same, we can add the numerators

j/k + 1/k = ?/k

(j+1)/k = ?/k

7 0
2 years ago
Trigonometry, IF answer is delivered on time WILL give BRANLIEST
Lunna [17]

Answer:

x=37°

y=6

Step-by-step explanation:

(ASSUMING BD is a perpendicular bisector of AC, otherwise answers maybe be wrong)

Consider the triangle ABC:

AB is the same length as BC (marked), meaning ABC is an isosceles triangle.

Since ABC is isosceles, ∠BAC=∠BCA=53

All angles in a triangle add up to 180:

180=∠ABC + ∠BAC + ∠BCA

180= ∠ABC + 53 +53

∠ABC = 180 - 106

∠ABC = 74

Assuming BD bisects ∠ABC perfectly, x is half of ∠ABC.

x=74/2=37

If BD bisects AC perfectly, AD=DC=y=6

8 0
3 years ago
108+621 is the same as 100+
notsponge [240]

Answer:

108+621= 100+629 hhh grade 2?

5 0
3 years ago
The product of two of three numbers is 7.8. if one number is 3/5, find the other number ( if you don't know please don't answer)
yarga [219]

Answer: 13,I

Step-by-step explanation:

set the 3 number is 3/5, x,y

product of them

3 /5 xy = 7:6

xy = 7:6 x 5 /3

Xy = 13

So the two number is 13, 1

Step-by-step explanation: hope this helped, Meow!

3 0
2 years ago
Mr.little earned $320 for working 2 eight hours shifts at the lumber yard .what is his hourly wage?
7nadin3 [17]

Answer:

Step-by-step explanation:

320$ divided by 16 (two 8 hr shifts) = 20 dollars an hour

3 0
2 years ago
Other questions:
  • 7 less than the ratio of 6
    9·1 answer
  • Read the attachment and complete the question in the attachment
    11·1 answer
  • Nan Compos-Mentis, a technical consultant, claims that she can increase average hourly productivity for the fabricators at Stryk
    10·1 answer
  • Can any body help me with 1 through 9 pls i will be very thankful:D
    7·1 answer
  • The plot below shows the length of each of the 7 bulletin boards hanging in the fifth grade hallway. All measurements are rounde
    7·1 answer
  • Zion weighed 7 pounds 9 ounces when he was born. How many ounces is that? (HINT: 1 pound = 16 ounces)
    6·2 answers
  • Find the product 1 1/4 x 5 3/5
    14·1 answer
  • Find mAC. Will give brainliest
    11·1 answer
  • Last month we had only five sunny days. There were 30 days in all last month.
    14·2 answers
  • Please help me I can not afford to fail this class!!!!
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!