JUNIOR MATHEMATICAL CHALLENGE 1. Exactly one of the following five numbers is not prime. Which is it?
A 101
B 103
C 107
D 109

all of these are prime numbers

115

Step-by-step explanation:

101+2=103

103+4=107

107+2=109

109+4=113

113+2=115

115+4=119

Therefore the next number is 11

the answer is a.

step-by-step explanation:

in three games of golf, alex shot two under par four times.

x = 2

step-by-step explanation:

if sr parallel to ba then the sides bc and ac are in proportion, that is

= ← substitute values

= ( cross- multiply )

27x = 6(4x + 1)

27x = 24x + 6 ( subtract 24x from both sides )

3x = 6 ( divide both sides by 3 )

x = 2