book Maths Puzzle Numerical Ability

Could you help me solve this problem the directions is multiply then simplify each expression The Expression is: (3x+2)(x^-5x+2)

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book Other Question

a dentist invested a portion of $15,000 in a 7% annual simple interest account and the remainder in a 6.5% annual simple interest goverment bond. the two investments earn $1020 in interest annually. how much was invested in each account. (1) 6.8cm= how many mm?

(2) 10mm= how many km.?

(3) 0.14mm = how many m.?

(4) 5dm = how many cm?

(5) 0.89cm= how many km?