All categories

3 years ago

-4x + 7 = -21 whats x AHSAJ I NEEDD HELPPP

Mathematics

2 answers:

yKpoI14uk [10]3 years ago

7 0

Answer:

-4x+7= -21

-4x= -21-7( this positive 7 will change to negative as we take in other side )

-4x = -28

Both the negative will be cancelled

4x = 28

x = 28/4

X = 7

therefore the X value is 7

Arturiano [62]3 years ago

4 0

- 4x+7=-21

-4x=-21-7

-4x=-28

x=7

Step-by-step explanation:

Like terms are collected first

The +7 moves to the other side of the equality sign making its sign negative (-7)

Two negatives makes a positive but the sign remains negative (when you have two numbers with a negative sign you sum them up but the sign of the sum remains negative)

Then divide both side by the coefficient of x which is - 4

-4x/4 =-28/4

The negative signs cancel out

x=7

You might be interested in

The width of a rectangle is 1.9 feet. The perimeter is 7.4 feet. What is the length?

dimaraw [331]

Answer:2.8 feet

Step-by-step explanation:

length(l)=?

breadth(b)= 1.9 feet

perimeter(p)=7.4 feet

we know,

p=2(l+b)

7.4=2(l+1.9)

7.4=2l+3.8

2l=7.4-3.8 (changing side and bringing 3.8 to 7.4 it gets -3.8)

l=3.6/2

l=2.8 feet

Hence,length is 2.8 feet

7 0

3 years ago

For triangle ABC, angle A=110, angle B=43, and side b=15. Find side c.

vredina [299]

Answer: 10

<u>Step-by-step explanation:</u>

First, find m∠C by using the Triangle Sum Theorem:

∠A + ∠B + ∠C = 180°

110 + 43 + ∠C = 180°

153 + ∠C = 180°

∠C = 27°

Next, Use the Law of Sines to solve for c:

$\dfrac{b}{sin\ B}= \dfrac{c}{sin\ C}$

$\dfrac{15}{sin\ 43}= \dfrac{c}{sin\ 27}$

$\dfrac{15\ sin\ 27}{sin\ 43}= c$

$10 = c$

8 0

3 years ago

The angle of elevation to the top of a 15-story skyscraper is measured to be 4from a point on the ground 2,500 feet from the bui

alexandr1967 [171]

The point of observation is 2500 m away from the foot of the building.

The angle of elevation is 4°.

We need to find the height 'h' of the building.

With respect to 4°,

2500 is the adjacent side.

'h' is the opposite side.

The trigonometric ratio associating opposite & adjacent is tan.

We have

$tan\theta =\frac{opposite}{adjacent}$

$tan4^{o}=\frac{h}{2500}$

Cross multiplying we get

h = 2500 tan4°

h= 174.82 m

Option B) is the right answer.

3 0

4 years ago

How do you break down this problem?

ozzi

What do you mean
Could you please insert an equation or a problem

8 0

3 years ago

Round to the nearest hundred. 367 +319

Naily [24]

Answer:

686 becomes 700

Step-by-step explanation:

367+319 = 686

hundreds tens one

6 8 6

We are rounding to the hundreds places

We have to look at the tens place

8>=5 so we will round up

6 becomes 7

686 becomes 700

6 0

3 years ago