All categories

4 years ago

The sum of twice a number and seven is 13. Find the number.

Mathematics

1 answer:

Furkat [3]4 years ago

3 0

Answer:

<h2>The answer is 3</h2>

Step-by-step explanation:

Let the number be x

The statement

twice a number is written as

The sum of twice a number and seven is written as

2x + 7

The result is 13

So we have

2x + 7 = 13

Subtract 7 from both sides

That's

2x + 7 - 7 = 13 - 7

2x = 6

Divide both sides by 2

That's

$\frac{2x}{2} = \frac{6}{2}$

We have the final answer as

Hope this helps you

You might be interested in

What is the reflection of point p(-1,6) across the line y=x

fiasKO [112]

It's the first one:)

6 0

3 years ago

Read 2 more answers

The amount of kerosene, in thousands of liters, in a tank at the beginning of any day is a random amount Y from which a random a

Tems11 [23]

Find the marginal density for $Y$ by integrating the joint PDF over all possible values of $x$ :

$f_Y(y)=\displaystyle\int_{-\infty}^\infty f_{X,Y}(x,y)\,\mathrm dx=\int_0^y2\,\mathrm dx$

$\implies f_Y(y)=\begin{cases}2y&\text{for }0$

Then the density of $X$ conditioned on $Y$ is

$f_{X|Y}(x\mid y)=\dfrac{f_{X,Y}(x,y)}{f_Y(y)}=\frac1y$

for $0$ and undefined elsewhere.

Thus

$P(0.25$

= = =

I'm not seeing the TeX rendering on any of my browsers. Maybe it's a site-wide issue? In any case, I'm attaching a picture of the text above in case it's incomprehensible.

5 0

4 years ago

SHOE COLLECTION: Marquise, Bron'Tavious, and JayDarius each have a shoe collection of Nike Air Vapor Max shoes. Marquise has two

Natasha_Volkova [10]

Answer:

(a) The number of shoes that Marquise has is 40 pairs of shoes

(b) The number of pairs of shoes that Bron'Tavious has is 20 pairs of shoes

Step-by-step explanation:

The given information are;

The number of shoes that Marquise has = 2 × The number of pairs of shoes that Bron'Tavious

The number of pairs of shoes that JayDarius has = The number of pairs of shoes that Bron'Tavious + 15

The total number of pairs of shoes they have all together = 95 pairs of shoes

Let the number of pairs of shoes that Bron'Tavious has = X. Therefore, we have;

The number of shoes that Marquise has = 2 × X

The number of pairs of shoes that JayDarius has = X + 15

The total number of pairs of shoes they have all together = X + X + 15 + 2 × X = 95

X + X + 15 + 2 × X = 95

4 × X + 15 = 95

4 × X = 95 - 15 = 80

X = 80/4 = 20

∴ X = 20

(a) The number of shoes that Marquise has = 2 × X = 2 × 20 = 40

The number of shoes that Marquise has = 40 pairs of shoes

(b) The number of pairs of shoes that Bron'Tavious has = X = 20

The number of pairs of shoes that Bron'Tavious has = 20 pairs of shoes

The number of pairs of shoes that JayDarius has = 35 pairs of shoes.

5 0

3 years ago

Help please picture attached

Naya [18.7K]

Answer:

-10

Step-by-step explanation:

3/5(b)=-6

Divide -6 by 3/5, you get -30/3.

4 0

3 years ago

PLEASE HELP ASAP!!! 30 PTS + BRAINLIEST FOR RIGHT/BEST ANSWER!!!

san4es73 [151]

Solve for X in the 2nd equation:

x+2z = 0

Subtract 2z from both sides:

x = -2z

Replace x in the first equation with -2z

-2z +y -z = 1

Combine like terms:

-3z +y = 1

Add 3z to both sides:

y = 3z +1

Replace x and y in the 3rd equation:

2(-2z) + 2(3z+1) = 4

-4z + 6z + 2 = 4

2z +2 = 4

2z = 2

z = 1

Now replace z with 1 in the other equations for x and y:

x = -2z = -2(1) = -2

y = 3z +1 = 3(1) +1 = 3+1 = 4

So you have x = -2, y = 4 ans z = 1

The answer would be written as (-2,4,1)

8 0

4 years ago