Write a grammar for a language whose sentences start with an even and non-zero number of x’s, end with an odd number of z’s, and have a number of y’s in between equal to the total number of x’s and z’s in the sentence. For example, xxzzz is a valid sentence.

An engine, weighing 3000 n, is supported on a pedestal mount. it has been observed that the engine induces vibration into the surrounding area through its pedestal at the maximum operating speed. determine the stiffness of the dynamic vibration absorber spring in (n/m) that will reduce the vibration when mounted on the pedestal. the magnitude of the exciting force is 250 n, and the amplitude of motion of the auxiliary mass is to be limited to 2 mm note: in this question type-in right numbers, no decimals, no fractions, no unit. approximate to right number if needed