Estimate. then find the difference.
324-285=

30

Step-by-step explanation:

324-285

WE can estimate the numbers to nearest tens or nearest hundreds

LEts estimate the numbers to nearest  tens and find the difference

324 round to nearest tens is 320

285 have 5 in once place that is equal to 5 so we add 1 with 8

285 round to nearest tens is 290

Now we find the difference

The difference is 30

If we estimate to nearest hundred then 300 -300 becomes 0

answer: cos [   arcsin (3/5) - arccos (1/2) ] =

step-by-step explanation: × = 3/5 = 0.6--> x = 36.87 and x = 180 - 36.87 = 143.13 deg

cos y = 1/2 --> y = +- 60 deg a. cos (x - y) = cos (143.13 - 60) = cos 83,13  

=

0.12

b. cos (36.87 - 60) = cos (-23.23) = 0.92