Expand.
If necessary, combine like terms.
(
3
x
+
7
)
(
3
x
−
7
)
=
(3x+7)(3x−7)=left parenthesis, 3, x, plus, 7, right parenthesis, left parenthesis, 3, x, minus, 7, right parenthesis, equals

9x^2-49

Step-by-step explanation: using pattern (a+b)(a-b)=a^2-b^2

(3x+7)(3x-7)=(3x)^2-7^2

=9x^2-49

62.5 paisa

step-by-step explanation:

4000*70 = 280000

280000-(2000*90) = 100000

4000-2400 = 1600

100000/1600 = 62.5

( give brainliest)

she would want to sell 10 full-year subscriptions and at least 9 half-year subscriptions to get a total of at least $300. 

i hope this answer you! if you have any further questions or concerns, feel free to ask! : )

step-by-step explanation:

mark brainliest!