All categories

2 years ago

What is the reciprocal of –5?

Mathematics

2 answers:

Leni [432]2 years ago

7 0

It is d (trust me im awesome) :P :) hope i helped (1/5 is correct
)

Anon25 [30]2 years ago

4 0

-5 is the same as -5/1

Flip the fraction:

-1/5

2/9 / 1/4

Flip the 2nd fraction and multiply:

2/9 * 4/1

Multiply the numerators and denominators:

8/9

You might be interested in

Find a positive number for which the sum of it and its reciprocal is the smallest (least) possible. Let x be the number and let

Allisa [31]

Answer:

$S(x) = x + \frac{1}{x}$ --- Objective function

Interval = $\{x:x=1\}$

Step-by-step explanation:

Given

Represent the number with x

The required sum can be represented as:

$x + \frac{1}{x}$

Hence, the objective function is:

$S(x) = x + \frac{1}{x}$

To get the the interval, we start by differentiating w.r.t x

Using first principle, this gives:

$S'(x) = 1 - \frac{1}{x^2}$

Equate S'(x) to 0 in order to solve for x

$0 = 1 - \frac{1}{x^2}$

Subtract 1 from both sides

$0 -1 = 1 -1 - \frac{1}{x^2}$

$-1 = - \frac{1}{x^2}$

Multiply both sides by -1

$1 = \frac{1}{x^2}$

Cross Multiply

$x^2 * 1 = 1$

$x^2 = 1$

Take positive square root of both sides because x is positive

$\sqrt{x^2} = \sqrt{1$

$x = 1$

Representing x using interval notation, we have

Interval = $\{x:x=1\}$

To get the smallest sum, we substitute 1 for x in $S(x) = x + \frac{1}{x}$

$S(1) = 1 + \frac{1}{1}$

$S(1) = 1 + 1$

$S(1) = 2$

Hence, the smallest sum is 2

3 0

3 years ago

Can some please help with this? :)

den301095 [7]

Answer:

Step-by-step explanation:

The stuff that is yellow is the answer!

6 0

2 years ago

Solve the following equation x(x + 19) = -34

xxMikexx [17]

Hi there,

x(x + 19) = -34

I'm going to solve your equation step-by-step.x(x + 19) = −34

Step 1: Simplify both sides of the equation.x2 + 19x = −34

Step 2: Subtract -34 from both sides.x2 + 19x − (−34) = −34 − (−34)

x2 + 19x + 34 = 0

Step 3: Factor left side of equation.(x + 2) (x + 17) = 0

Step 4: Set factors equal to 0.x + 2 = 0 or x + 17 = 0

x = −2 or x = −17

Answer:x = −2 or x = −17

Hope this helps! :)

5 0

3 years ago

Read 2 more answers

If a woman get 7000 dollars for every 3 hour how much will she make for 81 hours

vovikov84 [41]

Answer:

567000 dollars

Step-by-step explanation:

Straightforward if 7000 for 3 hours then 3*27=81 and 7000*81=567000

5 0

2 years ago

Read 2 more answers