exam Maths Puzzle Numerical Ability

Perform the indicated operation. 3rs(5r^2s-4rs+6rs^2)

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exam Other Question

Can someone please help me?
the magnitude of the vector -3i-5j is
a. -4
b. 4
c. sqrt 26
d. sqrt 34 I am retunning to school after 15 years and I am having problems with Algebra. Please help me to understand how to simplify equations.
4x+7-15x+50-11+12x