SOLUTION: in 1988 florence griffith joyner set a record of the 10.49 sec in the women's 100-m dash. the equation R=-0.0433t+10.49 can be used to estimate the world record in the women's 100

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Question 462488: in 1988 florence griffith joyner set a record of the 10.49 sec in the women's 100-m dash. the equation R=-0.0433t+10.49 can be used to estimate the world record in the women's 100-m dash t years after 1988. for what years are the records 10.057 sec and 9.494 sec?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+R+=+-.0433t+%2B+10.49+
given:
(1)
+R+=+10.057+
+10.057+=+-.0433t+%2B+10.49+
Subtract +10.49+ from both sides
+-.433+=+-.0433t+
Divide both sides by +-.0433+
+t+=+.433+%2F+.0433+
+t+=+10+
The record was 10.057 sec in 1988 + 10 = 1998
(2)
+R+=+9.494+
+9.494+=+-.0433t+%2B+10.49+
+-.996+=+-.0433t+
+t+=+23+ (rounded off)
The record was 9.494 sec in 1988 + 23 = 2011