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
Lerok [7]
3 years ago
15

10x+4y+ 12z=120 11x +77y =220 8x +2y +32z =160

Mathematics
1 answer:
Damm [24]3 years ago
6 0

Answer:

x=8.94 ; y = 1.58; z=2.02

Step-by-step explanation:

solve 10x+4y+12z = 120      →          5x+2y+6z = 60

         8x + 2y +32Z = 160   →           4x+y+16z = 80

To eliminate z multiply first equation by 16 and second equation by 6.

80x+32y+96z = 960

24x+6y+96z =   480

on subtractionwe get 56x+26y = 480

dividing by 2 we get, 28x + 13y = 240

Now we have a given equation 11x + 77y = 220 → x + 7y = 20

solving 28x + 13y = 240 and x + 7y = 20

28x + 13y =240

28x + 216y = 560

subtracting we get, 203y = 320

y = 1.58

x = 8.94

z = 2.02

You might be interested in
I don't understand how this would work. Ive tried to figure it out but i don't know.
barxatty [35]
A. Not sure !! .....l.......
8 0
3 years ago
If Jeannie invests $7,250 at a rate of 12%, compounded weekly, find the value of the investment after 10 years. $24,037.59 $16,0
Karolina [17]
Hi there!

• Principle amount, P = $ 7, 250

• Rate of interest, r = 12 %

• No. of weeks in an year, n = 52

• Time period, t = 10 years

Aₜ = P [ 1 + (\dfrac {r}{n}) ] ᴺ ˣ ᵀ

A₁₀ = 7, 250 [ 1 + (\dfrac {0.12}{52}) ] ⁵² ˣ ¹⁰

Simplifying :-

A₁₀ = $ 24,037.59

Hence,
Option [ 1. ] - $ 24,037.59 is Correct

~ Hope it helps!
8 0
3 years ago
Read 2 more answers
A city's population was 28,600 people in the year 2015 and is growing by 950 people a year. (a) give a formula for the city's po
ludmilkaskok [199]

p = 28600 + 950t
7 0
3 years ago
Read 2 more answers
GUYS HELP ME IM FAILING GEOMETRY AND I NEED HELP pleaseee I need help with both please I’m begging
Leokris [45]

Step-by-step explanation:

Here is the solution hope it helps:)

6 0
2 years ago
7. Jasmine buys a pack of 15 socks for $9.00. Shawn buys a pack of 20 socks for
egoroff_w [7]

Answer: Well if you buy a pack of socks with 15 for $9 you are not getting the best deal over buying a pack of socks with 20 for $11. The reason behind this is because each sock is worth $0.6 meaning that you are only paying two extra dollars for five socks which would have normally cost $3. Shawn (with the 20 pack) is saving $1.

6 0
3 years ago
Other questions:
  • If a boat depreciates in value according to the simple interest formula Y=20,000(.92)^2 find the rate of decay. Write as a perce
    12·1 answer
  • 2(x - 1) = x + 10<br> x<br> =
    6·2 answers
  • What is q? For this 30 and 60, 90 angle?
    8·1 answer
  • Can somebody please please help me !!!! I don’t know if the answer is A,B,C,D ! Help ASAP !!!
    14·2 answers
  • If there are 1500 guests, only 1 of them brought a coupon for free admission to the carnival?
    12·1 answer
  • What is the domain and range of Y=3X-7.25? can someone please help?
    14·1 answer
  • What percent of 640 is 160?
    8·2 answers
  • Please help i really need help ill give breinliest
    8·2 answers
  • Need help on the yellow question
    13·2 answers
  • Describe the solution(s) to 9x² - 36x + 36 = 0 by just determining the radicand. Show your work. (10 points) Part B: Describe th
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!