Answer:
each book is 20 dollars
Step-by-step explanation:
The graph is a circle, centered at the origin, with radius=4.
We know that we can write the equation of a circle with radius r and center (a,b) as :
.
Thus, substituting (a, b) with (0, 0) and r with 4, we have:
.
The solutions of this equation are all the points forming the circle shown in the picture. The solutions of this equation are still the same even if we multiply both sides of the equation by 2, because rewriting the equation as:
,
we would still have the same roots.
Thus, the equation of the circle can be written as :
.
Answer: B
In this type of questions, you just need to plug in the numbers you are given. But don't forget to put parentheses around negatives and use them wherever you want to clarify the equation.
Now let's take the exponents first:
Then do multiplications:
Then add plusses and minuses:
So the answer is -17.
Answer:
Write 0.72 as
0.72
1
Multiply both numerator and denominator by 10 for every number after the decimal point
0.72 × 100
1 × 100
=
72
100
Reducing the fraction gives
18
25
Answer:
243
Step-by-step explanation:
3x3=9
9x3=27
27x3=81
81x3=243