Which of these are partitions of the set of real numbers? a. the negative real numbers, {0}, the positive real numbers b. the set of irrational numbers, the set of rational numbers c. the set of intervals [k, k + 1], k = −2,−1,0, 1, d. the set of intervals (k, k + 1), k = −2,−1,0, 1,

let soccer = x and golf = y

part a

1st equation: x + y = 125

2nd equation: x = y +45

part b

replace x in the 1st equation with the 2nd one:

y + 45 + y = 125

simplify:

2y + 45 = 125

subtract 45 from each side:

2y = 80

divide both sides by 2:

y = 80/2

y = 40

she plays golf for 40 minutes.

part c

no because she plays soccer for 45 minutes longer than golf 40 +45 =   85 minutes, not 80 minutes.

42

step-by-step explanation:

if a = 1,   and b = 2, then the answer is 47.99999999. if you round that to the nearest whole number, the answer is 48.