The best estimate would be 35%.
7 out of the 20-coin sample were from before 1980; 7/20 = 35%.
Step-by-step explanation:
how can I help you ........
<span>8x^2-50
= 2(4x^2 - 25)
= 2(2x + 5)(2x - 5)
hope it helps</span>
Answer:
a
Step-by-step explanation: