|-9| means the absolute value of -9 which is 9
so we have 9 - 9 = 0 (answer)
Answer: 
Step-by-step explanation:
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The exercise is:</h3><h3>
"Dana loves rocks! She has 6 pieces of granite, 3 pieces of marble, 14 pieces of sandstone, and 1 piece of slate. What is the ratio of pieces of sandstone to pieces of marble in Dana's collection?"</h3><h3>
</h3><h3>
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You can use ratio to compare values.
By definition, ratios can be written in the following form:

In this case, you know that the number of pieces of different rocks that Diana has in her collections, are:

Since you must compare the number of pieces of sandstone and the number of pieces of marble in Dana's collection, you need to write the following ratio:

The correct answer is -2 I just took the test.
Answer: 1
Step-by-step explanation:
Simplify 9x+4x to 13x to get 13x=13
than dived both sides to get x=1
Let Q= the number of quarters and D= the number of dimes.
Q+D= 40 coins
0.25Q+0.1D= $7.75
Rewrite equation 1 as: D = 40-Q and substitute into equation 2
0.25Q+0.1(40-Q)= 7.75 Simplify the left side
0.25Q+4-0.1Q= 7.75 Subtract 4 from both sides
0.25Q-0.1Q= 3.75 Convime like terms on left side
0.15Q= 7.75 Divide both sides by 0.15
Q=25 and D= 40-Q
D= 40-25 which is 15
So Jenna had 25 quarters and 15 dimes.
<span>To check multiply 25 x 25 and 15x10 which equals 625 and 150 this equals 775 so this is 7.75</span>