12. To solve the equation 3x - 7 - - 2. Robert says the first step to solve is to subtract 7 from both sides. Evelyn says the first step is to add 7 to both sides. Who is correct? Justify your answer.​

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How many different triangles can be constructed with the angle measurements of 134° 10° and 36° ?

If the speed of an electromagnetic wave is 100,000 cm/s and its wavelength is 100 cm, what is its frequency? a) 100,000 cycles per second (hz) b) 1 × 10-3 cycles per second (hz) c) 10,000,000 cycles per second (hz) d) 1,000 cycles per second (hz)