AWARDING 30 POINTS HELP MY EXAM STARTS SOON AND I NEED TO KNOW HOW I GOT THIS ANSWER ILL GIVE BRAINLIEST

If the variance of the brain volume data is 17,689cm^6, what is the standard deviation? Answer is 133 how did they get that??

The triangles are similar. what is the value of x? show your work.

Use the distributive law to multiply. 3(4x + 5y + 6)

Each month, a shopkeeper spends 5x + 14 dollars on rent and electricity. if he spends 3x−5 dollars on rent, how much does he spend on electricity? for which value(s) of x is the amount the shopkeeper spends on electricity less than $100? explain how you found the value(s).