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deff fn [24]
3 years ago
15

Help pls i give u brainliest and 5 stars​

Mathematics
2 answers:
Vesnalui [34]3 years ago
5 0

Answer:

Surface area means all 6 sides

TOP side= 2 multiplied by 5

Bottom = 2 multiplied by 5

Right face   = 2 multiplied by 8.1

Left face = 2 multiplied by 8.1

Back side = 5 multiplied by 8.1

front side = 5 multiplied by 8.1

10+10+16.2+16.2+40.5+40.5 = 133.4 cm ^2

Mrrafil [7]3 years ago
5 0

Answer:

133.4 cm²

Step-by-step explanation:

The opposite faces of the cuboid are congruent, thus

front/ back = 2(8.1 × 5) = 2 × 40.5 = 81 cm²

top/ bottom = 2(5 × 2) = 2 × 10 = 20 cm²

sides = 2(8.1 × 2) = 2 × 16.2 =32.4 cm²

Thus

Surface area = 81 + 20 + 32.4 = 133.4 cm²

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3 years ago
Stereo has a list price of $150 but is on sale for 20% off the list price what is the sale price of the stereo???
8_murik_8 [283]

Answer:

The correct answer is option A.120

Step-by-step explanation:

Let's start by analyzing the information they have given us.

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3 0
3 years ago
Read 2 more answers
A baseball is hit into the​ air, and its height h in feet after t seconds is given by h(t)= -16t^2+128t+2. The height of the bas
tankabanditka [31]

Answer:

\large \boxed{\sf \ \text{2 feet, 4 seconds, 258 feet } \ }

Step-by-step explanation:

Hello,

To know the height of the baseball when it is hit we have to compute h(0), as t = 0 is when the baseball is hit into the air.

h(0)=-16\cdot 0^2+128 \cdot 0+2=2

So, the answer is <u>2 feet.</u>

<u />

h(x) is a parabola which can be written as ax^2+bx+c, it means that the vertex is the point (-b/2a,h(-b/2a)).

The baseball reached its maximum height after

   \dfrac{-b}{2a}=\dfrac{-128}{-2*16}=\boxed{4 \text{  seconds}}

And the maximum height of the baseball is h(4).

h(0)=-16\cdot 4^2+128 \cdot 4+2=-256+512+2=\boxed{258 \ \text{feet}}

Hope this helps.

Do not hesitate if you need further explanation.

Thank you

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3 years ago
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yan [13]

Answer:

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