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WINSTONCH [101]
3 years ago
5

What's the answer for 12=0.9a

Mathematics
2 answers:
dmitriy555 [2]3 years ago
6 0
Hey!

First, let's write the problem.
12=0.9a
Let's switch sides. This is done so that we end up with the a on the left side. 
0.9a=12
To remove the decimal, let's multiply both sides by 10.
0.9a\cdot \:10=12\cdot \:10
9a=120
Divide both sides by 9.
\frac{9a}{9}=\frac{120}{9}

This tells us that our final answer would be,
a=\frac{40}{3}

Thanks!
-TetraFish
Ainat [17]3 years ago
3 0
Solving for variables is easy as all we must do is isolate the variable and simplify. In this case, we need to divide "a" by 0.9 (because the variable is being multiplied by 0.9).

 12=.9a
 /.9   /.9
<u />     <u>  
</u>13.3=a
                                                                       <u /> <u>   </u>
Using the math above, we can see that a=13.3.
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Constructing a brick staircase: A brick staircase has a total of 30 steps. The bottom step requires 100 bricks. Each successive
galben [10]
A) The first step needs 100 bricks, the second needs 98, the third needs 96, and so on. Therefore the number of bricks for the nth step is: a_n = a_1 + d(n-1), where a_1 = 100 (the first term), d = -2 (difference).
a_n = 100 - 2(n-1) = 102 - 2n, and for the 30th step, a_30 = 102 - 2*30 = 42. So the top step will need 42 bricks.

b) The total staircase will need: 100 + 98 + 96 + ... +  44 + 42, and there are n = 30 terms. Using the formula for the sum of an arithmetic sequence:
S = (a_1 + a_n)*n/2 = (100 + 42)*30/2 = 2130
Therefore, 2130 bricks are required to build the entire staircase.
7 0
3 years ago
Simplify this answer pls
ipn [44]

Answer:

D

Step-by-step explanation:

when it's a power of the power we multiply the powers to get a single value for the power.

(6^(1/4))^4=6^(4*(1/4)) (4*(1/4)=1)

=6^1=6

so the answer is D

7 0
3 years ago
a building with a height of 32m casts a shadow that is 20m long. a person standing casts a shadow that is 1.2 m long how tall is
wlad13 [49]
Most of the information's required for solving the question is already given in the question.
Height of the building that casts a shadow of 20 m = 32 m
Then
Height of the man that casts a shadow of 1.2 m = (32/20) * 1.2 meter
                                                                             = 3.2 * 1.2 meter
                                                                             = 3.84 meter
So the actual height of the person casting a shadow of 1.2 meter is 3.84 meters. I hope that the procedure used for solving the problem is easy enough for you to understand. You can definitely use this method in future for solving problems of similar type without requiring any additional help from outside.

6 0
3 years ago
NEED THE ANSWER ASAP
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Not 100% sure this is right but
60cm^2
8 0
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3 0
2 years ago
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