Find the exact value of the following numerical expressions. show your solution neatly.

Give the mathematical symbols. 7. the total fare of m passenger of a tricycle at p0.45 per passenger is p13.50 8. the sum of the twice product of 3a and the square of b, and the difference of thrice x and 20 is 245. 9. seventy fve equals the product of negative 5 and the cube of x, plus forty six. 10. add 25 to the quotient of 2m and 4n to get 12 times m.

The mass of a chocolate truffle is 0.025 kg, correct to 2 significant figures. what is the smallestpossibel mass of the chocolate truffle​

One half of heathers age two years ago from now plus one third of her age 3 years ago is 20 years.how old is she now?