Those 3 multiple choice questions correctly and show work i need it today

#17 -40+11-13-5+18=-29 so b is your answer
#18 3.5x5=17.5 so b is your answer
#19 7000x1.2=8400 8400-7000=1400 so b is your answer

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First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.