Answer to page 143 lesson 15, new york progress in mathematicson monday morning, grace ran 2 5/8 miles in 1/3 of an hour. her afternoon run took only 1/6 of an hour, but it was 1 1/4 miles shorter than her morning run. what was grace's average speed for the day?

a) justify

step-by-step explanation:

justifying is just part of everyday life. justify kind of means proof so i think the answer is a) justify.

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.

jeff jeff

step-by-step explanation:

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