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3 years ago

Please help if you know the answer please!

Mathematics

2 answers:

quester [9]3 years ago

7 0

36 I believe.....................

mash [69]3 years ago

5 0

Answer:

Step-by-step explanation:

We know that the perimeter is 30.

2 x 6 is 12 and 30 - 12 is 18. We subtract 12 because we want to know the other sides

18 is the length of the remaining sides so we just divide by 2 and we get 9.

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Y=40+90x what is the meaning

Dafna1 [17]

Y = total cost
40 = The one time fee
90 = the service charge per month
x = number of months

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3 years ago

how many pounds of coffee worth $10 a pound should be added to 20 pounds of coffee worth $4 a pound to get a mixture worth $5 a

Solnce55 [7]

Answer:

Step-by-step explanation:

1. if the mass of coffee worth $10 is 'x', then its worth is 10x, and the worth of the mixture is 5(x+20);

2. using the previous item it is possible to write the next equation:

5(x+20)=4*20+10*x; ⇒ x=4.

3. the required mass is 4 pounds.

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3 years ago

9 pencils for 11 dollars

BlackZzzverrR [31]

Answer:

wow

Step-by-step explanation:

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2 years ago

The regular price of a tablet case is $38.45. During a sale, the case was marked as 25% off. What was the approximate price of t

Pani-rosa [81]

C 28.84 just multiply 38.45 by .25 then you should get 9.6125 you subtract 38.45 by 9.6125 and get 28.84

6 0

3 years ago

Read 2 more answers

Type the correct answer in each box. Use numerals instead of words. If necessary, use / for the fraction bar(s).

ddd [48]

Answer:

$f'(x) = 4x^2 - 3$ for $x \le -3$

Step-by-step explanation:

See attachment for proper question

Given

$f(x) = -\frac{1}{2}\sqrt{x + 3}$

For

$x \ge -3$

Required

Determine the inverse function

$f(x) = -\frac{1}{2}\sqrt{x + 3}$

Replace f(x) with y

$y = -\frac{1}{2}\sqrt{x + 3}$

Swap the positions of x and y

$x = -\frac{1}{2}\sqrt{y + 3}$

Multiply both sides by -2

$-2 * x =-2 * -\frac{1}{2}\sqrt{y + 3}$

$-2x =\sqrt{y + 3}$

Square both sides

$(-2x)^2 =(\sqrt{y + 3})^2$

$4x^2 =y + 3$

Make y the subject

$y = 4x^2 - 3$

The inverse has been solved. So, we need to replace y with f'(x)

$f'(x) = 4x^2 - 3$

Next, is to determine the interval

$x \ge -3$

Change inequality to $\le$

$x \le -3$

Hence, the inverse function is:

$f'(x) = 4x^2 - 3$ for $x \le -3$

7 0

3 years ago