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SashulF [63]
3 years ago
6

Upon registration, new members of the American cD club receive 30 cDs for review. Each month the club sends its members 2 more c

Ds for their review. Bobby has purchased every CD sent to him. How many CDs has Bobby purchased during his 9 months of membership?
Mathematics
1 answer:
Pani-rosa [81]3 years ago
6 0
520 CD's because of the 9 months and we add 30 time 9 we erase the 0 and multiply the 3 with the 9 it will be 27 right we add the zero because the originla number is 30
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How to put 412.638 in expanded form using decimals
sergeinik [125]

The <em>correct answer</em> is:


400 + 10 + 2 + 0.6 + 0.03 + 0.008.


Explanation:


To write a number in expanded form, we use place values.


4 is in the hundreds place; this makes its value 400.

1 is in the tens place; this makes its value 10.

2 is in the ones place; this makes its value 2.

6 is in the tenths place; this makes its value 0.6.

3 is in the hundredths place; this makes its value 0.03.

8 is in the thousandths place; this makes its value 0.008.


To write this together, we find the sum:

400 + 10 + 2 + 0.6 + 0.03 + 0.008.

7 0
3 years ago
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What is the area of the triangle??? helpppp
MAVERICK [17]

Answer:

210 ft^2

Step-by-step explanation:

The area of a triangle is

A = 1/2 bh where b is the base and h is the height

Since this is a right triangle  the base is 20 ft and the heigth is 21 ft

A = 1/2 ( 20) * 21

210 ft^2

4 0
3 years ago
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PLEASE HELP WITH THIS PLEASE.
Kryger [21]

Answer:

C

Step-by-step explanation:

(a^2+b^2)^2=a^2+b^2

3 0
2 years ago
The roots of the quadratic equation $z^2 + az + b = 0$ are $2 - 3i$ and $2 + 3i$. What is $a+b$?
AlladinOne [14]
We know for our problem that the zeroes of our quadratic equation are (2-3i) and (2+3i), which means that the solutions for our equation are x=2-3i and x=2+3i. We are going to use those solutions to express our quadratic equation in the form a x^{2} +bx+c; to do that we will use the <span>zero factor property in reverse:
</span>x=2-3i
x-2=-3i
x-2+3i=0
<span>
</span>x=2+3i
x-2=3i
x-2-3i=0
<span>
Now, we can multiply the left sides of our equations:
</span>(x-2+3i)(x-2-3i)= x^{2} -2x-3ix-2x+4+6i+3ix-6i-3^2i^2
<span>= </span>x^{2}-4x+4-9i^{2}
= x^{2} -4x+4+9
= x^{2} -4x+13
Now that we have our quadratic in the form a x^{2} +bx+c, we can infer that a=1 and b=-4; therefore, we can conclude that a+b=1+(-4)=1-4=-3.
6 0
3 years ago
Which expression finds the measure of an angle that is coterminal with a 126° angle?
N76 [4]
The expression that gives an angle that is coterminal with 126 is 126 + 720n. Two angles are said to be coterminal if when they are drawn in a standard position, their terminal sides are on the same location. The expression will give an angle which when it is drawn the terminal sides are on the same location with the 126 angle.
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3 years ago
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