What is the answer Which equations support the fact that rational numbers are closed under addition?

Select each correct answer.

35‾√+5‾√=45‾√

12+0.5=1

316‾‾‾√+316‾‾‾√=616‾‾‾√

10‾‾‾√+(−10‾‾‾√)=0

The edge of a cube was found to be 30 cm with a possible error in measurement of 0.4 cm. use differentials to estimate the maximum possible error, relative error, and percentage error in computing the volume of the cube and the surface area of the cube. (round your answers to four decimal places.) (a) the volume of the cube maximum possible error cm3 relative error percentage error % (b) the surface area of the cube maximum possible error cm2 relative error percentage error %

Scores on the cognitive scale of the bayley-scales of infant and toddler development range from 1 to 19, with a standard deviation of 3. calculate the margin of error in estimating the true mean cognitive scale score, with 99% confidence, if there are 12 infants and toddlers in a sample.

Evaluate each expression. determine if the final simplified form of the expression is positive or negative -42 (-4)2 42