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DIA [1.3K]
3 years ago
15

A book costs $4.75 plus sales tax. After sales tax, the book is $5.13. What is the approximate sales tax rate?

Mathematics
1 answer:
maria [59]3 years ago
6 0

Answer:

Step-by-step explanation:

5.13 - 4.75 = 0.38

4.75 / 0.38 = 12.5

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12-2(n-1)=-18<br><br> aa help plzz
Luda [366]

Answer:

n=16

Step-by-step explanation:

Let's solve your equation step-by-step.

12−2(n−1)=−18

Step 1: Simplify both sides of the equation.

12−2(n−1)=−18

12+(−2)(n)+(−2)(−1)=−18(Distribute)

12+−2n+2=−18

(−2n)+(12+2)=−18(Combine Like Terms)

−2n+14=−18

−2n+14=−18

Step 2: Subtract 14 from both sides.

−2n+14−14=−18−14

−2n=−32

Step 3: Divide both sides by -2.

−2n /−2  =  −32 /−2

n=16

8 0
3 years ago
Two Social Security numbers (see Exercise 8.12) match zeros if a digit of one number is zero iff the corresponding digit of the
Roman55 [17]

Answer:

Proved

Step-by-step explanation:

From the given parameters, we have:

n = 9 i.e. the length of each security numbers

r = 2 i.e. 2 security numbers

Required

In 513 security numbers, 2 must have matching zeros

To do this, we make use of Pigeonhole principle.

First, we calculate the number of all security numbers not having matching zeros.

Each of the 9 digits can be selected in 2 ways.

2 ways implies that each digit is either 0 or not

So, total selection is:

Total = 2^9

Total = 512

Apply Pigeonhole principle

The principle states that: suppose there are n items in m containers, where n>m, then there is at least one container that contains more than 1 item.

This means that if there are 512 security number without matching zeros, then there is 1 (i.e. 512 + 1) with matching zeros.

512 + 1 = 513

8 0
3 years ago
What is the slope of the line that passes through (-1,-2) and (-1,-3)
jok3333 [9.3K]
Slope: (y2-y1)/(x2-x1)
(-3+2)/(-1+1) = -1/0 = undefined
The slope is undefined
7 0
3 years ago
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What is this I need to know now
katen-ka-za [31]
3x2 is six. If you do that across, you would get 6/6 for both. 6/6 - 6/6 is how much?
7 0
3 years ago
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Which of the following fractions is not in simplest form?<br> 4/15<br> 7/10<br> 9/12<br> 3/4
Dominik [7]

Answer:

9/12

Step-by-step explanation:

Both 9 and 12 can be divided by 3, so it is not in simplest form.

8 0
2 years ago
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