Find the perimeter of a rectangle whose length is 3 cm greater than its height, and whose area is 40 cm².

Step-by-step explanation:

The perimeter of a rectangle can be calcualated with this formula:

Where "l" is the lenght and "h" is the height.

 The area of a rectangle can be found with this formula:

Where "l" is the lenght and "h" is the height.

In this case we know that:

Therfore, we can susbsitute them into and solve for "h" in  order to find its value:

Find two number whose sum is 3 and whose product is -40. These are -5 and 8. Then, factorizing, we get:

The positive value is the height. Then:

Since the length is 3 centimeters greater than its height, we get that this is: Then:

Substituting values into , we get that the perimeter is:

The perimeter of a rectangle : 26 cm

There are several properties possessed by rectangular shapes, namely:

There are two rectangular shapes namely square and rectangle

Square if all sides are the same length

The formula used in rectangular is:

Rectangle

Area (A) = l x h

h = height

l = length

Square

Area (A) = a²

a = length of side

Rectangle

Perimeter = P = 2 (l + h)

h = height

l = length

Square

P = 4 x a

a = length of side

length is 3 cm greater than its height

we translate this sentence into Algebraic expressions

l = 3 + h

Then :

Area = l x h

Area = (3+h)h

40 = 3h+h²

h²+3h-40 = 0

factorizing ⇒ (h-5)(h+8)=0

h1 = 5 and h2 = -8

we take positive values h1 = 5

l = 3 + h

l = 3 + 5

l = 8

the perimeter of a rectangle :

The ratio of the perimeters

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The coordinates of the vertices of a rectangle

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Solve the equation for w

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part a

in a city ice cream is mostly only bought when the temperature is very high as ice cream cools down our

so we can derive the conclusion that as the temperature increases the number of ice creams sold also increases

part b

y intercept is 5

slope is 2

happy to

pls mark as brainliest

hope this is what you were asking for!

step-by-step explanation: