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3 years ago

What is the surface area? please show work

Mathematics

1 answer:

hram777 [196]3 years ago

7 0

Answer: 144

Step-by-step explanation:

You add up the area of each side

the two triangular sides- A=BH/2 3 times 4 divided by 2 so 6 but there are two triangles so you multiply by two so 12

the bottom rectangle- A=LW 4 times 11 so 44

the top rectangle- A=LW 5 times 11 so 55

the back rectangle- A=LW 3 times 11 so 33

12+44+55+33=144

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Helen [10]

Tom eats 3/8 for $5.16
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3 years ago

The function A = A 0 e -0.0077x models the amount in pounds of a particular radioactive material stored in a concrete vault, whe

AysviL [449]

Answer:

After 80 years 432 pounds of radioactive element will be remaining.

Step-by-step explanation:

A function $A_{t}=A_{0}e^{-0.0077x}$ models the amount of a radioactive material.

Here x = number of years taken for decay.

If $A_{t}=432$ pound and $A_{0}=800$ pound, then we have to calculate the time for decay.

$A_{t}=A_{0}e^{-0.0077x}$

$432=800e^{-0.0077x}$

$e^{-0.0077x}=\frac{432}{800}$

Take log on both the sides of the equation

$ln(e^{-0.0077x})=ln(\frac{432}{800} )$

-0.0077x = ln(0.54)

-0.0077x = -0.616186

x = $\frac{0.616186}{0.0077}$

x = 80.02 years

Therefore, After 80 years 432 pounds of radioactive element will be remaining.

6 0

3 years ago

Find the arc length<br> 210°<br> 13 cm

tamaranim1 [39]

Answer:

47.67

Step-by-step explanation:

210/360×2×22/7×13

=47.67

7 0

3 years ago

How to divide 15 into 3 equa lgroups

Andrei [34K]

15 divided by 3 = 5 equal groups

3 0

3 years ago

Read 2 more answers

Which is the graph of f(x) = log x + 3?

Fiesta28 [93]

Answer:

The second graph

Step-by-step explanation:

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4 years ago

What is the surface area? please show work ​

What is the surface area? please show work