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4 years ago

8)

Mathematics

1 answer:

Firlakuza [10]4 years ago

4 0

Answer:

Step-by-step explanation:

Start at C and count the steps to B

3 steps

Another way

C - B

1 - (-2)

1+2 = 3

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Margie and four of her friends are eating lunch at a restaurant. The total bill is $52.50 before tax and tip.

musickatia [10]

Part A- DISCOUNT-SALES TAX--- 42.5
WITH TAX-- 45.05

part b- the tip is... 10.5

part c- 11.11

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3 years ago

How many 1/3s are in 1 2/3 the hexagon represents 1 whole

Vikki [24]

We need to find, how many 1/3s are in 1 2/3 the hexagon represents 1 whole.

In order to find that value, we need to divide 1 2/3 by 1/3.

Let us first convert 1 2/3 into improper fraction first.

1 2/3 = (1*3+2)/3 = 5/3.

Therefore,

5/3 ÷ 1/3.

Changing division sign into multiplication and flipping the second fraction, we get

5/3 × 3/1

3's cross out from top and bottom, we get

= 5.

<h3>Therefore, there are 5 times of 1/3s in 1 2/3.</h3>

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4 years ago

Determine whether each of these functions is a bijection from r to r.

Naddika [18.5K]

Answer:a

Step-by-step explanation:

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3 years ago

If x2+1/x2=18, find the value of x3−1/x3

Elden [556K]

Answer:

There are 2 answers : 76 or -76

Step-by-step explanation:

$x^2+\dfrac{1}{x^2} =18\\\\(x-\dfrac{1}{x} )^2=x^2+\dfrac{1}{x^2} -2=18-2=16\\\\x-\dfrac{1}{x}=4\ or\ x-\dfrac{1}{x}-4\\\\(x-\dfrac{1}{x} )^3=x^3-\dfrac{1}{x^3} -3x^2*\dfrac{1}{x}+3x*\dfrac{1}{x^2}\\\\=x^3-\dfrac{1}{x^3}-3(x-\dfrac{1}{x})\\\\x^3-\dfrac{1}{x^3}=(x-\dfrac{1}{x} )^3+3(x-\dfrac{1}{x})\\\\if\ x-\dfrac{1}{x}=4\ then \ x^3-\dfrac{1}{x^3}=4^3+3*4=64-12=76\\\\if\ x-\dfrac{1}{x}=-4\ then \ x^3-\dfrac{1}{x^3}=(-4)^3+3*(-4)=-64-12=-76\\\\$

7 0

3 years ago

Read 2 more answers

7x + 2y = 17<br>2x - 2y = 1<br>=

DerKrebs [107]

Answer:

$(2,\frac{3}{2}})$

Step-by-step explanation:

For finding the system of equations you can use one of two methods. There's the elimination method and also the substitution method. For this I think the best way we could go at solving this is by using the elimination method. Since we can eliminate the 2y. We can then solve for x and then we'll go from there.

$\left \{ +{{7x+2y=17} \atop {2x-2y=1}} \right. \\\\9x=18\\x=2$

Now that we know what x is we can substitute it for one of the equations and then we will be able to solve for y.

$7x+2y=17\\7(2)+2y=17\\14+2y=17\\2y=3\\y=\frac{3}{2}$

So now we have the x and the y and once we place them together we can get the solution of those two equations, and the solution is $(2,\frac{3}{2}})$ .

5 0

3 years ago