Can someone help me out my math grads are bad

Mathematics

2 answers:

dimaraw [331]3 years ago

7 0

Answer:

Perimeter = 9x + 12x + 15x

Perimeter = 36x (simplified)

dybincka [34]3 years ago

7 0

Answer:

Step-by-step explanation:

First answer: 9x+12x+15

Second answer: 21x+15

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What is the perimeter of this triangle? 15 cm 5 cm 25 cm 10 cm

Lady_Fox [76]

Answer:

Step-by-step explanation:

Add 15+5+25+10 which is 55

hope this helps! :)

3 0

3 years ago

find the interest earned on an account with $450 principal, and interest rate of 6% over a period of 8 years

puteri [66]

8
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3 years ago

If w = 12 units, x = 7 units, and y = 8 units, what is the surface area of the figure? Figure is composed of a right square pyra

bearhunter [10]

Answer:

720 sq units.

Step-by-step explanation:

Length and width of square prism, w = 12 units

Height of square prism, x = 7 units

Height of square pyramid, y = 8 units

Please have a look at the attached image.

Here 2 Surfaces will not be exposed which are base of the square pyramid and the top of the square prism i.e. 2 square surfaces will not be exposed.

Here, surface area of the composite figure will be:

<em>Surface Area of Composite Figure = Lateral surface area of Square Pyramid + Surface Area of 5 surfaces of the square prism</em>

For finding the lateral surface area of pyramid, we need to find the slant height of the pyramid.

Let slant height be $l$ units.

Using pythagoras theorem, we can find out the value of $l$ .

As per theorem:

$Hypotenuse^{2} = Base^{2} + Height^{2}\\$

$\Rightarrow l^{2} = (\dfrac{w}{2})^{2} + y^{2}\\\Rightarrow l^{2} = (\dfrac{12}{2})^{2} + 8^{2}\\\Rightarrow l^{2} = {6}^{2} + 8^{2}\\\Rightarrow l^{2} = 36+64 = 100\\\Rightarrow l = 10\ units$

Lateral surface area of square prism = 4 $\times$ Area of triangular surface

$\Rightarrow 4 \times \dfrac{1}{2}\times Base \times Slant\ Height\\\Rightarrow 4 \times \dfrac{1}{2} \times 10 \times 12\\\Rightarrow 240\ sq\ units$