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3 years ago

Hello guys so I have one question and can you please tell me how you got the answer and show you work. Thank you

1 answer:

7 0

So we have to work out the price of 1 for each.

20 divided by 23 is 0.8696
12 divided by 15 is 0.8.

So Bob has a better sale as you can get more cans for cheaper if you work out one

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Casey paid $32 for a book that was on a sale at 20% off. What was the original price for that book?

Elis [28]

Answer:

$40

Step-by-step explanation:

If it was 20% off, you are paying 80% of the original price.

So .80 * Original price = $32

32/.8 = 40

8 0

3 years ago

Read 2 more answers

If f(x) = 3x + 7, which of these is the inverse of f(x)?

dolphi86 [110]

Answer:

f-1(x)=x-7/3

Step-by-step explanation:

7 0

3 years ago

PLZ HELP ASAP I RLLY NEED THE HELP

postnew [5]

Answer: just do 10.8×9×6 and divide the answer by two

Step-by-step explanation:

6 0

3 years ago

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For f (x)= -x + 8, what is the value of x for which f(x) = 9?

Elina [12.6K]

Answer:

x=-1

Step-by-step explanation:

f (x)= -x + 8

Let f(x) = 9

9 = -x+8

Subtract 8 from each side

9-8 = -x+8-8

1 = -x

Multiply each side by -1

-1 = x

8 0

3 years ago

What is the line of symmetry for the parabola whose equation is y=-x^2-x+2

Delicious77 [7]

Answer:

$\huge \boxed{\sf \ \ x=-\dfrac{1}{2} \ \ }$

Step-by-step explanation:

Hello,

We need to express this parabola using this kind of expression

$y=a(x-b)^2+c$

and then, the line of symmetry will be the line x = b

Let's do it !

$\text{*** Complete the square ***} \\ \\ x^2+x=x+2\cdot \dfrac{1}{2}\cdot x=(x+\dfrac{1}{2})^2-\dfrac{1^2}{2^2}=(x+\dfrac{1}{2})^2-\dfrac{1^2}{4} \\ \\ \text{*** Apply it to our parabola } \\ \\y=-x^2-x+2=-(x^2+x)+2=-[(x+\dfrac{1}{2})^2-\dfrac{1}{4}]+2 = -(x+\dfrac{1}{2})^2+\dfrac{1+2*4}{4}= -(x+\dfrac{1}{2})^2+\dfrac{9}{4} \\ \\ \text{*** It comes ***} \\ \\ \Large \boxed{\sf \ \ y=-(x+\dfrac{1}{2})^2+\dfrac{9}{4} \ \ }$

So the line of symmetry is

$\huge \boxed{\sf \ \ x=-\dfrac{1}{2} \ \ }$

Hope this helps.

Do not hesitate if you need further explanation.

Thank you

4 0

3 years ago