Math questions.20 points solve for x show work if possible.

1.  x=9

2  x=9

3  x=10

4   x=7

Step-by-step explanation:

1. 15+5x + 14x-6 = 180   supplementary angles

combine like terms

9 + 19x = 180

subtract 9 from each side

19 x = 171

divide by 19

19x/19 = 171 /19

x = 9

2. 13x-7 = 11x+11   corresponding angles are equal

subtract 11x from each side

2x -7 = 11

add 7 to each side

2x = 18

divide by 2

x =9

3.  x+ 100 = 90  alternate interior angles are equal

subtract 100 from each side

x = -10

4.  17x+1 = 120   alternate exterior angles are equal

subtract 1 from each side

17x = 119

divide by 17 on each side

x = 119/17

x=7

answer: .64

step-by-step explanation

set up the formula for standard deviation for this set of numbers, then simplify

answer: the sun

explanation:

water cycle describes the evaporation of water from earth's surface, formation of clouds and precipitation water back onto the surface of earth. seventy percent of the earth is covered with water in the form of seas and oceans. the heat of the sun causes the evaporation of water from the surface of the ocean. the water vapors rise and condense to form water droplets. the collection of these water droplets form clouds which rain down again.

the evaporation of the oceans surface water as part of the water cycle is caused by the sun