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artcher [175]
3 years ago
10

A notebook costs $4.50 plus sales tax . After sales tax , the notebook is $4.86. What is the sales tax rate?

Mathematics
2 answers:
UkoKoshka [18]3 years ago
6 0

Answer:

8%

Step-by-step explanation:

0.36/4.50=0.08=8%

Ipatiy [6.2K]3 years ago
6 0
The answer to your question is 8%
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X^2 - y^2 = 100
luda_lava [24]

Answer:

20

Step-by-step explanation:

Let's start by rewriting the second equation in terms of "x":

x+y=5

Subtract y from both sides:

x=5-y

Now, substitute "5-y" for "x" in the first equation:

(5-y)^2-y^2=100

Note that:

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

25-10y+y^2-y^2=100

Cancel out like terms:

25-10y=100

Subtract 25 from both sides:

-10y=75

Divide both sides by -10

y=\frac{75}{-10}=\frac{15}{-2}=-\frac{15}{2}

Now, substitute this value back into either of the equations to solve for x.

x+y=5\\x-\frac{15}{2}=5\\

Add 15/2 to both sides:

x=5+\frac{15}{2}\\x=\frac{10}{2}+\frac{15}{2}\\x=\frac{25}{2}

Now, find the difference:

x-y=\frac{25}{2}-(-\frac{15}{2})=\frac{25}{2}+\frac{15}{2}=\frac{40}{2}=20

8 0
2 years ago
Write down the 3rd term in the sequence given by: T(n) = n2 + 4 pls explain how to do It plsss
crimeas [40]

Answer:

T(3) = 13

Step-by-step explanation:

If we are trying to find the 3rd term of this <em>specific </em>sequence, then we simply plug in 3 as n.

T(3) = (3)² + 4

T(3) = 9 + 4

T(3) = 13

However, this isn't proper notation for an arithmetic or geometric sequence.

8 0
3 years ago
Read 2 more answers
X + 7y = "70" 3x − 6y = −33 step by step
Aneli [31]

Answer:

x=7

y=9

Step-by-step explanation:

x+7y=70   ...(1)

3x-6y=-33

divide by 3

x-2y=-11   ...(2)

(1)-(2) gives

x+7y-x+2y=70+11

9y=81

y=9

x-2*9=-11

or x=-11+18=7

3 0
3 years ago
HELP I’m being timed!!
lubasha [3.4K]

Answer:

A 1/4

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
The mass of the particles that a river can transport is proportional to the sixth power of the speed of the river. A certain riv
katrin2010 [14]

Answer:

7.25

Step-by-step explanation:

200m/s^6 = m/3^6

s^6 = 200*3^6

s = 3*200^(1/6) = 7.25 mi/hr

Hope I helped!


8 0
3 years ago
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