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Paha777 [63]
3 years ago
6

-28< -7n solving one step inequalities

Mathematics
2 answers:
deff fn [24]3 years ago
8 0

Answer:

-4 < n

Step-by-step explanation:

Anon25 [30]3 years ago
7 0

Answer:

4>n

Step-by-step explanation:

The sign flips because it is being divided by a negative number and -28 divided by -7 is +4. A neg/neg = positive.

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Solve the radical equation. Which solution is extraneous? The solution x=-1 is an extraneous solution. Both x=-1 are x=-7 true s
FrozenT [24]

Answer:

Both x = -1 and x = -7 are true solutions.

Step-by-step explanation:

Given

x + 1 = \sqrt{-6x - 6}

Required

Solve

x + 1 = \sqrt{-6x - 6}

Take square of both sides

(x + 1)^2 = -6x - 6

Open bracket

x^2 + 2x + 1 = -6x -6

Express as:

x^2 + 2x+6x + 1 +6=0

x^2 + 8x + 7=0

Expand

x^2 + 7x +x + 7=0

Factorize

x(x + 7) + 1(x + 7) = 0

Factor out x + 7

(x + 1)(x + 7) = 0

Solve:

x + 1 =0\ or\ x + 7 = 0

So:

x = -1\ or\ x=-7

8 0
3 years ago
Last year,Jim opened an investment account with $7400. At the end of the year, the amount in account had increased by 26.5%. How
KonstantinChe [14]

Step-by-step explanation:

I=prt

I=7400×(26.5/100)×1

I=$1961

total money 7400+1962= $9361

7 0
3 years ago
Water needs to be removed from an underground chamber before work can commence. When the water was at a depth of 3m, five suctio
fredd [130]
We would need to use 4 pipes to be sure to empty the chamber within 10 hours time. 

Work: 
5*5/3*4/10=3 1/3 pipes (but we must round since we cant have 1/3 of a pipe running. This means that we must have 4 pipes.
8 0
4 years ago
Find the value of x.<br>m&lt;2= 10x + 10<br>​
Gekata [30.6K]

Answer:

The answer to your question is x = 3

Step-by-step explanation:

Data

m∠2 = 10x + 10

exterior angle = 110°

x = ?

Process

1.- Find the measure of the angle supplementary to the angle 110°. It will be angle y.

    180° = 110° + y

- Solve for y

     y = 180 - 110

     y = 70

2.- From the picture we conclude that the triangle is Isosceles because two of its sides measure the same.

In an Isosceles triangle two of its angles measure the same so,

       180° = 70° + 70° + ∠2

- Solve for ∠2

       ∠2 = 180 - 70 - 70

       ∠2 = 40

3.- Find x

      10x + 10 = 40

Solve for x

      10x = 40 - 10

      10x = 30

          x = 30/10

          x = 3          

     

5 0
3 years ago
Solve for x. (x - 5)(x - 5) = 0
OverLord2011 [107]

Answer:

x=5

Step-by-step explanation:

(x - 5)(x - 5) = 0

x-5=0

x=5

6 0
3 years ago
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