All categories

3 years ago

Equation 4x - 9 = 7x + 12 explanation please

Mathematics

1 answer:

dedylja [7]3 years ago

8 0

Answer:

x=-7

Step-by-step explanation:

first, subtract 4x from both sides. then you'll get:

-9=3x+12

next subtract 12 from both sides. Then you'll get:

-21=3x

then you divide each side by 3. You get:

x=-7

You might be interested in

A right triangle has a leg of 12 cm and a hypotenuse of 19 cm.

Yakvenalex [24]

Answer:

14.7 cm

Step-by-step explanation:

Using Pythagoras Theorem,

The length of the other leg

$= \sqrt{ {19}^{2} - {12}^{2} }$

$= \sqrt{217}$

$= 14.730919...$

= 14.7 cm (rounded to the nearest tenth)

6 0

3 years ago

I NEED HELP ASAP I DONT UNDERSTAND THIS!!

zheka24 [161]

Let the cost of the hair dryer equal x.

The net cost plus a 40% markup equals 42, set up an equation and solve forex.

1.4x = 42

Divide both sides by 1.4

X = 42 / 1.4

X = 30

The net cost was £30

3 0

3 years ago

In two or more complete sentences describe how to determine the appropriate model for the set of data. (1, 1), (3, 2), (6, 3), (

Dafna1 [17]

Answer:

3,2

Step-by-step explanation:

hope you like it then comment

5 0

3 years ago

SOMEONE HELP ASAP PLZ!Z!!!!!

lina2011 [118]

The answer is obviously not A and B so that leaves us with only C or D and the one that id the best choice would have to be C because it gives good information about how it is used and where it would be installed

Hope this helped : )

7 0

3 years ago

Answer it right and i'll try to give you brainliest.

mario62 [17]

Answer:

384 cm²

Step-by-step explanation:

Since it is a square pyramid, the total surface area of the pyramid is the area of its square base plus the area of its 4 triangular faces.

$\boxed{area \: of \: triangle = \frac{1}{2} \times base \times height }$

Area of a triangular face

= ½ ×12 ×10

= 60 cm²

$\boxed{area \: of \: square = side \times side}$

Base area of pyramid

= 12 ×12

= 144 cm²

∴ Surface area of pyramid

= 4(60) +144

= 240 +144

= 384 cm²

7 0

2 years ago