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
spayn [35]
3 years ago
11

Need an answer, please need an answer, please​

Mathematics
1 answer:
erica [24]3 years ago
3 0
  • perimeter=70cm
  • Area=300cm^2

#1

  • Length=L
  • Breadth=B

For perimeter.

We know

\\ \sf\longmapsto Perimeter=2(L+B)

\\ \sf\longmapsto 2(L+B)=70

\\ \sf\longmapsto L+B=\dfrac{70}{2}=35\dots(1)

For area

\\ \sf\longmapsto Area=LB

\\ \sf\longmapsto LB=300

#2

  • L+B=35
  • LB=300

#3

Putting in (a+b)^2 formula.

\\ \sf\longmapsto (L+B)^2=L^2+B^2+2LB

#4

  • Solving quadratic equation

\\ \sf\longmapsto 35^2=L^2+B^2+2(300)

\\ \sf\longmapsto 1225=L^2+B^2+600

\\ \sf\longmapsto L^2+B^2=625

Put in (a-b)^2 formula

\\ \sf\longmapsto (L-B)^2=L^2+B^2-2AB

\\ \sf\longmapsto (L-B)^2=625-600

\\ \sf\longmapsto (L-B)^2=25

\\ \sf\longmapsto L-B=\pm 5

  • But we shall take it positive as its dimension.

\\ \sf\longmapsto L-B=5\dots(2)

Adding eq(1) and eq(2)

\\ \sf\longmapsto 2L=40

\\ \sf\longmapsto L=20

Putting in eq(1)

\\ \sf\longmapsto 20+B=35

\\ \sf\longmapsto B=35-20=15

  • Length=20cm
  • Breadth=15cm
You might be interested in
An alloy composed of nickel, zinc, and copper in a 4:1:2 ratio. How many kilograms of each metal are needed to make 35 kg of thi
gregori [183]

Answer:


Step-by-step explanation:

The ration of weight of nickel, zinc, and copper in an alloy is 4:1:2

The weight of alloy can be written as

4x + x + 2x = 35 Kg

7 x = 35 Kg

X = 35 Kg/7

X = 5kg

The weight of nickel the alloy = 4 x 5 = 20 Kg

The weight of zinc in the alloy= 1 x 5 = 5kg

The weight of copper in the alloy = 2 x 5 = 10 kg


7 0
4 years ago
Read 2 more answers
Help!<br> It's a picutre
9966 [12]

Here is your answer

a) 5x-2y= 1

REASON:

6-2(x-y)=3x+5

6-2x+2y= 3x+5

3x+2x-2y= 6-5

5x-2y= 1

HOPE IT IS USEFUL

3 0
3 years ago
Find the perimeter of the shape
dezoksy [38]

Answer:

29.71

Step-by-step explanation:

8+6+5pi

14+15.71

29.71

15.71 is approx 5pi

6 0
3 years ago
I have a test and only have an hour please hurry! <br><br><br><br> 90 / 3* (9 +6)=?
Alex777 [14]
90/3=30 30*(15)=450 450 is your answer.
5 0
4 years ago
Read 2 more answers
Please help me find the area of this figure
Harman [31]

Answer:

=51.63 m^2

Step-by-step explanation:

First find the area of the triangle

A = 1/2 bh = 1/2(3) * 5 = 7.5

Then find the area of the rectangle

A = l*w = 5*6 = 30

Then find the area of the semi circle, which is 1/2 the area of the circle

The diameter is 6 so the radius is 3

A = 1/2  pi r^2 = 1/2 (3.14) (3) ^2 = 14.13

Add the areas together for the total area

7.5+30+14.13

=51.63

5 0
3 years ago
Other questions:
  • What is 19 divided by 27?
    6·2 answers
  • Is 20 ÷ (x + 2) = 5 a equation or expression?
    13·2 answers
  • Eliza earns $48,000. Then, $3,000 is deducted in income taxes. $45,000 is deposited into her bank account. Which amount is her n
    7·1 answer
  • The distance between NY and Boston is 306 km. How long is it on a map (in cm) drawn at a scale of 1:1,200,000?
    10·2 answers
  • (1) Suppose Sanjay has a large pile of identical black marbles and a large pile of identical orange marbles. (a) How many ways c
    10·1 answer
  • Find a common denominator for the pair of fractions 3/4 and 1/3 then write equivalent fractions with the common denominator.
    15·2 answers
  • Jordan can make 18 cupcakes (the y-value) with one cup of flour (the x value). How many cupcakes can he make with 5 cups of flou
    6·1 answer
  • Find the quotient 12/15÷6/11​
    10·1 answer
  • Solve: x - (-6) = -2
    10·1 answer
  • 5. The bus fair oe 8 passangers is Rs 640 If the fair decreased by Rs 5 per passanger How many passangers can travel for Rs 900
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!