Ithink of a number multiply by two then subtract 9

The correct mathematical represention of the expression involving the product of a number and 2 then subtracting 9 is 2n - 9

Product of the number and 2 can be expressed as :

Subtracting 9 from the product ;

Therefore, the mathematical expression of the sentence is 2n - 9

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2n - 9

Step-by-step explanation:

Let the number be n.  Then "a number multiply by two then subtract 9" yields

2n - 9

answer:  

step-by-step explanation:

here x represents the height of the pole,

and, the height of the shadow of the pole is 12 feet.

also, the angle of elevation from the top of the pole is 40°,

therefore,

by the low of sine,

which is the required equation for finding the value of x,

75

step-by-step explanation: