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balu736 [363]
4 years ago
11

Twice the difference of a number and 9 is 7​

Mathematics
2 answers:
Hoochie [10]4 years ago
6 0
(x-9)^2=7
“twice the difference of a number” would mean x-9 twice equals 7
lozanna [386]4 years ago
3 0

Answer:

x=12.5

Step-by-step explanation:

Let the number be x

2(x-9)=7

2x-18=7

2x=7+18

2x=25

x=25/2

x=12.5

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3 years ago
A square has a side length of (2x + 4) inches.
Oksi-84 [34.3K]

Answer:

The answer is C, E and F .

Step-by-step explanation:

Given that the area of square is, Area = length×width. In a square, all sides are equal so you have to substitute (2x+4) into the formula :

Let length be (2x+4) inches,

Let width be (2x+4) inches,

Area = (2x+4)(2x+4)

= (2x+4)² (option C)

= 4x² + 16x + 16 (option F)

= 4(x² + 4x + 4) (<em> </em><em>F</em><em>a</em><em>c</em><em>t</em><em>o</em><em>r</em><em>i</em><em>z</em><em>e</em><em> </em>)

= 4(x+2)² (option E)

You can use the formula, (a+b)² = a² + 2ab + b² to evaluate quickly.

5 0
3 years ago
Read 2 more answers
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