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
olga2289 [7]
3 years ago
12

Please help!!! Use an algebraic equation to solve the problem. The sides of a triangle are in the ratio 3 : 4 : 5. What is the l

ength of each side if the perimeter of the triangle is 90 cm?
A. 22.5 cm, 30 cm, and 37.5 cm
B. 7.5 cm, 11.5 cm, and 32.1 cm
C. 10.5 cm, 11.5 cm, and 12.5 cm
D. 19.3 cm, 25.7 cm, and 32.1 cm
Mathematics
2 answers:
azamat3 years ago
4 0
3:4:5.....added = 12

3/12(90) = 270/12 = 22.5
4/12(90) = 360/12 = 30
5/12(90) = 450/12 = 37.5

looks like it is gonna be A
Effectus [21]3 years ago
3 0

Answer:

A. 22.5 cm, 30 cm and 37.5 cm

Step-by-step explanation:

To find the perimeter of a triangle, all the sides are added together:

A + B + C = Perimeter

Knowing the ratio of the sides, all the sides can be multiplied by a common factor, for the ratio to stay the same. Adding up these factors, setting it equal to a perimeter of 90, and solving:

3x + 4x +5x = 90

12x = 90

x = 7.5 cm

Side Lengths

  • 3 * 7.5 = 22.5 cm
  • 4 * 7.5 = 30 cm
  • 5 * 7.5 = 37.5 cm
You might be interested in
Please help me with these two questions, 10 points for each so in total 20!!
saul85 [17]

Answer:

\large\boxed{Q2.\qquad C.\ -2x+y=-2}\\\boxed{Q4.\qquad C.\ y=3x+12}

Step-by-step explanation:

Q2:

The point-slope form of an equation of a line:

y-y_1=m(x-x_1)

m - slope

The formula of a slope:

m=\dfrac{y_2-y_1}{x_2-x_1}

We have the points (4, 6) and (6, 10). Substitute:

m=\dfrac{10-6}{6-4}=\dfrac{4}{2}=2

y-6=2(x-4)           <em>use distributive property</em>

y-6=2x-8      <em>add 6 to both sides</em>

y=2x-2          <em>subteact 2 from both sides</em>

-2x+y=-2

Q4:

The slope-intercept form of an equation of a line:

y=mx+b

m - slope

b - y-intercept

Put the slope m = 3 and the coordinateso f the point (-2, 6) to the point-slope form of an equation of a line:

y-6=3(x-(-2))

y-6=3(x+2)         <em>use distributive property</em>

y-6=3x+6     <em>add 6 to both sides</em>

y=3x+12

4 0
3 years ago
6x9x(-5) what is the answer to this question?
9966 [12]
-270. Use the google calculator.
7 0
3 years ago
(image is question) ................................
Nimfa-mama [501]

Answer:

2x^2

Step-by-step explanation:

If you're going to double x^2, you just need to multiply it by 2. You can just put the 2 in front of the x^2 because the order of operations says to do exponents before multiplication.

6 0
2 years ago
Which one is it , I’m having a hard time I’m a freshman.
IgorC [24]
I believe it should be C
5 0
3 years ago
Read 2 more answers
Help me!!!!!!!!!!!!!
vlada-n [284]
He will be running 24 min on 5th day
8 0
3 years ago
Other questions:
  • What are the domain and range of the function
    14·2 answers
  • Simplify the answer -12 ÷ 3 × (-8 + (-4)² - 6) + 2 I need the steps for the equation on how to solve it.
    12·1 answer
  • Determine the value of the variable in the simplified expressions. What is the value of x in this simplified expression? x = Wha
    9·1 answer
  • Write the equation for the translation. y=cos x; translated 5 units right.
    7·1 answer
  • WILL GIVE BRAINLIEST IF CORRECT NOT TOO HARD JUST IN A RUSH!!!!!
    10·1 answer
  • NEED HELP ASAP ! answers !
    8·1 answer
  • Find the coordinates of the point which divides the line segment joining the points (4, -3) and (8,5) in the ratio 3:1 internall
    8·1 answer
  • Can you please help me with this?​ 50pts if it's correct.
    15·2 answers
  • Help me for brainliest!!!!!!!!!!!!!!!!!!
    15·1 answer
  • Simplify 5/12 x 1/12<br>A. 1/5<br>B. 5/144<br>C. 12/60<br>D. 5​
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!