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3 years ago

Find the surface area of a rectangular prism that is 12 cm long 7 cm wide and 1.6 cm high

Mathematics

1 answer:

Gnom [1K]3 years ago

3 0

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This semicircle has a diameter of 5 meters.

Ira Lisetskai [31]

Area of semicircle is given by:
$A_sc = \frac{1}{2} \pi r^2$

r is the radius, and we are given the diameter. Radius is half the diameter, so it's 2.5m. Let's plug that into the formula (using 3.14 as an estimation for pi):
$A_t = \frac{1}{2}(3.14)(2.5)^2 = 9.81m^2$

So, the area of this semicircle is 9.81m².

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3 years ago

Which of the following would be a good reason to place your money into a savings account? a. You can purchase stocks with a savi

mart [117]

Answer: B. a savings account earns interest

Step-by-step explanation: Money loses value over time as the rate of inflation increases. In this scenario, when you have some money to spare, the ideal is to seek some kind of investment that earns interest.

Saving is one such option. The money in savings earns interest and is highly liquid, meaning it can be used at any time. In addition, saving is a very...

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4 years ago

Multiply negative 1 over 6 multiplied by negative 1 over 5

xz_007 [3.2K]

-1/6 x -1/5

Convert fractions

1 x 5

6 x 5

-5/30

1 x 6

5 x 6

-6/30

-5/30x-6/30

1/30(Used a calculator to multiply)

hope it helps!

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3 years ago

Which expression makes the equation true?

N76 [4]

1. C.

The rule of powers is that when a parenthesis is raised to a power, you multiply the two numbers. Since it is being raised to the second power, it needs to have a 10 in the parenthesis. That would make 20.

2. B

Firstly 10^2 = 100, so we know that the number must be 10. That leaves us with just A and B. Then we know the same thing from the previous equation, that they need to be multiplied together.

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4 years ago

luvenia can row 4mph in still water. She takes as long to row 7 mi upstream as 21 mi downstream. how

xeze [42]

Answer:

The speed of the river is 2mph.

Step-by-step explanation:

I guess that we want to find the speed of the river.

First, remember the relation: speed*time = distance

If the speed of the river is Sr, when Luvenia moves downstream (in the same direction that the flow of the water) the total speed will be equal to the speed of Luvenia in still water plus the speed of the water:

Sd = 4mph + Sr

and at this speed, in a time T, she can move 21 miles, so we have:

Sd*T = (4mph + Sr)*T = 21 mi

When moving upstream, the speed will be:

Su = (4mph - Sr)

and in the same time T as before, she moves 7 miles, so we have the equation:

Su*T = (4mph - Sr)*T = 7 mi

Then we have two equations:

(4mph + Sr)*T = 21 mi

(4mph - Sr)*T = 7 mi

Now we can take the quotient of those two equations and get:

((4mph + Sr)*T)/((4mph - Sr)*T) = 21/7

The time T vanishes, and we can solve it for Sr.

(4mph + Sr)/(4mph - Sr) = 3

4mph + Sr = 3*(4mph - Sr) = 12mph - 3*Sr

4*Sr = 12mph - 4mph = 8mph

Sr = 8mph/4 = 2mph.

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4 years ago

Find the surface area of a rectangular prism that is 12 cm long 7 cm wide and 1.6 cm high￼

Find the surface area of a rectangular prism that is 12 cm long 7 cm wide and 1.6 cm high