Help I’d help a lot thank u very much

The two terms must have a subtraction sign between them, hence the "difference" in "difference of squares". Also, the two terms must be perfect squares. In the case of choice D we have

100x^2 = (10x)^2

49y^2 = (7y)^2

So 100x^2 - 49y^2 = (10x)^2 - (7y)^2. It is now in the form a^2-b^2 and we'll use the difference of squares factoring rule

a^2 - b^2 = (a-b)(a+b)

Something like 55 is not a perfect square since sqrt(55) = 7.416 approximately is not a whole number.

hope this !

step-by-step explanation:

d = distance between moon and sun, which in this problem is the hypotenuse of a right triangle.  

the distance y is the side opposite to angle x in the right triangle.   use the definition of the sine function from basic trigonometry.

sin(x) = y/d ⇒

d = y/sin(x)

just do 5.2 + 2 ( 7.2) and 1/3 x 3 (.9) and youv'e got your equation. 0.9( 9/10) + 7.2 ^2 = 16.4 hope i could !

step-by-step explanation: