Baseball pitchers ages 9 to 14 were followed for 10 years. Four out of 26 who had pitched at least 100 innings in one year had elbow surgery, shoulder surgery or retirement due to a throwing injury. Of 128 who had not pitched this much 6 had such problems (based on data). a. Compute the percentage of each group who have such problems. Compute the difference of the percentages. What is the name for this difference? Write an explanation, for parents of young pitchers, that explains its meaning

b. Compute the ratio of the percentages of each group who have such problems. What is the name for this difference. Then write an explanation, for parents of young pitchers, that explains its meaning.

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

60°

step-by-step explanation:

the measure angle of c in an isosceles triangle abc is 60° because in isosceles triangle,the measures of all the angles is 60°.

( - 4 , -7 )

all the lines must parallel  

step-by-step explanation:

coordinates of c = ( - 1 , 2 )

3 units left = ( -4 , 2 )

9 units down = ( - 4 , 11 )