How can I find a quadratic equation that is found by points (60,430), (80,280) and (100,280) also how can I predict what the corresponding number will be if I put in 50?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter9: Quadratic Functions And Equations
Section9.3: Solving Quadratic Equations By Graphing
Problem 35PPS
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How can I find a quadratic equation that is found by points (60,430), (80,280) and (100,280) also how can I predict what the corresponding number will be if I put in 50? Thank you

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