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2 years ago

The diffence between a number x and 13 is 18

Mathematics

1 answer:

alexdok [17]2 years ago

4 0

18+ 13 gives you 31 so the difference between 13 and 31 is 18.

the answer is 31

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Which of the following equations is quadratic?

djverab [1.8K]

Answer:

The quadratic equation is (x + 3)(x + 4) = 5

Step-by-step explanation:

If the degree of a polynomial is two then the polynomial is known as a quadratic.

Now, in the given equations we see which polynomial has a degree 2.

Simplify the first equation

$x(x^2+1)=0\\x^3+x=0$

Degree is 3 and hence it is not a quadratic.

Take 2nd equation

$5(4x+2)=3\\20x+10=3$

Degree is 1 and hence it is not a quadratic.

Finally, we simplify the third equation

$(x+3)(x+4)=5$

Apply FOIL method to simplify the left hand side

$x^2+4x+3x+12=5=5$

Degree is 2 and hence it is a quadratic equation.

5 0

3 years ago

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A ship sailed 30 kilometers in 1 1/2 hours. What is was its rate in kilometers per hour?

PilotLPTM [1.2K]

Answer:

20km/hr

Step-by-step explanation:

Given that a ship sailed 30km in one and a half hours. We need to find out the rate of ship in kilometres/hour . The rate is also called Speed.

Speed:- Distance travelled per unit time is called Speed .

Here , according to Question,

Distance = 30 km

Time = 1½ hrs .

We know that ,

$\rm\implies Distance = Speed \times Time$

Subsequently ,

$\rm\implies Time = \dfrac{Distance}{Time}$

Substitute the respective values ,

$\rm\implies Rate =\dfrac{ 30km}{ 1.5 hrs }$

We can write 1.5 as 3/2 , therefore ,

$\rm\implies Rate = \dfrac{ 2\times 30}{3} km/hr$

Simplify the RHS ,

$\rm\implies\boxed{\blue{\rm Rate = 20\ km/hr}}$

Hence the Rate/Speed of the ship is 20km/hr .

8 0

3 years ago

An ice cream parlor serves ice cream cones, milkshakes, and waffles with ice cream. The cost of an ice cream cone is $1.20, the

loris [4]

this answer is $1.90

im not sure of the work to get to the answer

6 0

3 years ago

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Using the information provided, identify the domain and range. (2 points)

nevsk [136]

Answer:

Domain: all real numbers, where $x\geq 2$

Range: all real numbers, where $y\geq 3$

Step-by-step explanation:

I hope this helps!

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2 years ago

The cost of producing x soccer balls in thousands of dollars is represented by h(x) = 5x + 6. The revenue is represented by

Firdavs [7]

Answer:

(k-h)(x) = 4x - 8

Step-by-step explanation:

We know Profit = Revenue - Cost

Basically we gotta subtract cost function from revenue function and get the profit function.

The cost function is h(x) = 5x + 6

The revenue function is k(x) = 9x - 2

Hence, Profit is:

(k-h)(x) = (9x - 2) - (5x + 6)

(k-h)(x) = 9x -2 - 5x - 6

(k-h)(x) = 4x - 8

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2 years ago

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