Using the table, give the percentage associated with each unit of standard deviation in the standard normal curve to the nearest hundredth.
Area, A(x)
Area, A(x)
0.4953
0.2 0.0793
0.4 0.1554
0.6 0.2257
0.8
0.2881
1.0 0.3413
1.2 0.3849
1.4 0.4192
1.6 0.4452
1.8 0.4641
2.0 0.4772
2.2 0.4861
2.4 0.4918
2.6
2.8 0.4974
3.0 0.4987
3.2 0.4993
3.4 0.4997
3.6 0.4998
3.8 0.4999
4.0 0.5000
Standard Deviation Percentage Area
-1 to O
%
O to +1
%
O to +2
O to +3
%
-1 to +2

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.

yes i do see that. i say this because i am doing my very best in high school so i can get a scholarship and credits.  

we need to divide the number of toy dinosaurs, 156, by the number of brothers, 4:

in order to estimate, we can use compatible numbers:

156 ÷ 4

  ↓

160   ÷ 4 = 40        

the correct answer is a).