MA138 Exam 1 in-class review

m + n = n + m

shows the...

• Associativity of addition

• Commutativity of addition

• Additive identity

• Additive inverse

m + (n + p) = (n + m) + p

shows the...

• Associativity of addition

• Commutativity of addition

• Additive identity

• Distributive property

an + ap = a(n + p)

shows the...

• Associativity of multiplication

• Commutativity of multiplication

• Multiplicative identity

• Distributive property

In a geometric sequence, successive numbers have..

• a common ratio

• a common difference

• both

• neither

Write an algebraic equation relation your pay, P, if you are paid $12 per hour.

Use t to represent the number of hours you work.

• P = 12

• P = 12t

• P= 12 + t

• P = t

Write an algebraic equation relation for your pay, P, if you are paid a base rate of $30 and an additional $10 for each computer you sell.

Use c to represent the number of computers you sell.

• P = 30 + 10

• P = 30+ 10c

• P = 30c + 10

• P = 10c

Write an algebraic equation relation for the temperature, T, if the temperature is 25 degrees and is falling at a rate of 3 degrees per hour.

Use t to represent the number of hours that have passed.

• T = -3t +25

• T = 3t - 25

• T = 3t + 25

• T = -3t - 25

What is the 50th term in an arithmetic sequence whose first term is 18 and whose common difference is 1/2?

• 24.5

• 25

• 42.5

• 43

What is the 8th term in a geometric sequence whose first term is 3 and whose common ratio is 2?

• 128

• 256

• 384

• 768

Does this situation describe a function?

Each Purdue student and their Purdue ID number

• yes

• no