The third term of an arithmetic sequence is 15 and when 20 is added to the third term the 8 term is obtained
a) What is the common difference of the sequence?
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b) What is the position of 103 in this sequence?​

The swimming pool is open when the high temperature is higher than 20∘c. lainey tried to swim on monday and thursday (which was 3 days later). the pool was open on monday, but it was closed on thursday. the high temperature was 30∘c on monday, but decreased at a constant rate in the next 3 days. write an inequality to determine the rate of temperature decrease in degrees celsius per day, d, from monday to thursday.

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2

In need of in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.