A study was conducted of the trend in the design of social robots. In a random sample of 113 social robots, 67 were built with legs only, 21 were built with wheels only, 9 were built with both legs and wheels, and 16 were built with neither legs nor wheels. Use the rule of complements to find the probability that a randomly selected social robot is designed with either legs or wheels or both.

97/113

Step-by-step explanation:

67 robots have legs only, 21 have wheels only, and 9 have both legs and wheels.  The total number of robots with legs and/or wheels is 97.

The probability is 97/113.

x = -4

step-by-step explanation:

- 20 - 4(x + 3) = 4x

=> -20 - 4x - 12 = 4x

=> - 32 -4x = 4x

=> -32 = 4x + 4x

=> - 32 = 8x

=> -32/8 = x

=> -4 = x

180-142=38 for the acute angle next to the entry

90+38=128

180-128=52

a=52

step-by-step explanation: