A similarity between electromagnetic waves and matter waves.

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 Question: : A similarity between electromagnetic waves and matter waves?

electromagnetic waves are the combination of electric field and magnetic field and the matter wave related to dicrete particles. They are both waves (obviously), and both are made of particles which obey the equation E = hf. Where E is the energy of a particle and f is its frequency. Matter waves can move at varying speeds, and matter waves can be at rest. EM waves always move at c in vacuum.

i cant see the choices man

the expression 15n + 2(3p) represents the amount isaiah spent buying gasoline and snacks, where n represents the price of each gallon of gasoline and p represents the cost of each snack that he bought. which statement is true about the amount isaiah spent?