find the dot product, a * b.

a=6i+5j, b= -5i +4i

a.50 b. < 1,9> c. -10 d. < -30,20>

i think d is right but i have doubts

Suppose you want just guess at the answers in a 5 question multiple-choice test. each question has 3 responses and only one is correct. what is the probability of getting two questions right just guessing? 20 points 0.3275 0.2753 0.7532 none of the above

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Point b lies between points a and c on . let x represent the length of segment ab in inches. use the segment to complete the statements. the value of x is . the length of in inches is . the length of in inches is .