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3 years ago

Joseph rings up an item that costs $960. After sales tax, the total is $1,056. What is the sales tax percentage?

Mathematics

1 answer:

Verizon [17]3 years ago

7 0

1056/960-1=10%
..............

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Quadratic equations and functions. <br> n^2+2n-15=0

sveta [45]

Answer:

n = -5, 3.

Step-by-step explanation:

n^2 + 2n - 15 = 0

Let's check if we can factor this quadratic:

We need 2 numbers whose product is -15 and whose sum is +2.

There are 2 such numbers and they are +5 and -3, so the factors are:

(n + 5)(n - 3) = 0.

n + 5 = 0 or n - 3 = 0

therefore the zeroes are -5 and 3.

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3 years ago

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Y=4x+7 ordered pairs

andreyandreev [35.5K]

Well here are 3

(0,7);(1,11);(2,15)

4(0) + 7 y:7

You can keep doing it choose a number for x that's and for y multiply 4 times the numer you choosed for x and add 7 to it

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3 years ago

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In ΔSTU, the measure of ∠U=90°, ST = 9.7 feet, and US = 4 feet. Find the measure of ∠T to the nearest degree.

BaLLatris [955]

Answer:

Around 24 degrees

Step-by-step explanation:

*Make sure calculator is on degree mode*

Try to draw out triangle--it helps

Need to use law of sines... this is where an angle and the side that opposes it are equal to each other. For example, Angle U is equal to 9.7

$\frac{sin\alpha }{4} = \frac{sin90}{9.7}$

Multiply 4 and sin90 and then divide the product by 9.7

Use $sin^{-1}$ on calculator to convert the answer into degrees

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3 years ago

Is Frieda’s work correct? Explain how she can check her solution.

lyudmila [28]

Answer:

Frieda's work is correct.

Step-by-step explanation:

z+22= 64 can also be z= 64-22

64-22= 42

Meaning, z= 42

42+22-22= 64-22

42= 42

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3 years ago

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I need help with my pre-calculus homework, please show me how to solve them step by step if possible. The image of the problem i

Anna [14]

We know that the law of sines states that:

$\frac{\sin\alpha}{a}=\frac{\sin\beta}{b}$

For simplicity, let:

$\beta=m\angle A_1BC$

In triangle A1BC this leads to:

$\begin{gathered} \frac{\sin31}{5}=\frac{\sin\beta}{6} \\ \sin\beta=\frac{6}{5}\sin31 \\ \beta=\sin^{-1}(\frac{6}{5}\sin31) \\ \beta=38.174 \end{gathered}$

Therefore:

$m\angle A_1BC=38.174$

Now, triangle A2BC is isosceles which means that both the base angles are equal, since angle CA1B and A2A1B are supplementary we have:

$m\angle CA_2B=180-38.174=141.826$

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1 year ago