Write an explicit formula for the sequence. Use the formula to find the eighth term in the sequence. arithmetic: A(1) = 9, d = −3

1: A(n)=9+(n−1)(−3);−12

2: A(n)=9n+3n; 25

3 A(n)=9n−3;69

4: A(n)=9−3n; −15

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?

Alex measured the length of an item to be 3.7 cm. the actual length is 3.5 cm. what is alex’s percent error?

Margie is practicing for an upcoming tennis tournament. her first serve is good 20 out of 30 times on average. margie wants to know the estimated probability that her first serve will be good at least four of the next six times she serves. how could she design a simulation for this scenario?