Explain how to use benchmarks to estimate 0.28 + 71

You make .28 in to a percent and add and make sure to convert 71 as a percent.

28%+71%=92%

Now take a way the percent sign.

I'll do the first one for you. it isn't very hard at all.on number one, you have (50 × 3), which equals 150, and (3 × 3), which equals 9. after you establish that, you add 150 and 9 together. so, (150 + 9) equals 159.this means that 53 × 3 = 159.

Distance=slopeslope is -2/4which equals-1/2the distance between these two points is -1/2