exam Maths Puzzle Numerical Ability

Given,
log 398.4 = 2.6003
log 39.84 = 1.6003
log 3.984 = 0.6003

make a conjecture concerning the decimal values in the approximations of common logarithms of numbers greater

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exam Other Question



joe can paint a room in 6 hours less than billy. if they can paint the room in 4 hours working together, how long would it take each to paint the room working alone?

can you please solve this using the quadratic equations?? thanks!!
x-4y+5z=-4
2x+y-7z=-23
-4x+5y+2z==38

Write the linear system as a matrix equation.