Book Maths Puzzle Algebra

A shepard has some sheep. He buys 3 more sheep. Now he has 7 times as many sheep than if he had sold 3 sheep instead of buying 3 sheep. How many sheep does he have now?

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Book Other Question

I need to know how to solve a quadratic eq.
y-1=(x-3)^2 I have to find the vertex, x-intercepts, and y-int.
Also the same for x^2+2x-3

thank you!! Hello,
My name is Taylor Ferguson. I am 12 years old in 7th grade. we are learning solving equations but i quit dont know the point of it still. if you could help me that would