Answer:
Cross Price Elasticity (Splishy Splashy & Raskels) = -0.8 
Cross Price Elasticity (Splishy Splashy & mookies) = 1.2 
Mookies are recommended to me marketed with Splishy Splashies. 
Step-by-step explanation:
Substitutes are goods that are inter changeable for a want. Complements are goods that are jointly demanded for a want. 
Substitutes price & demand are inversely related, cross price elasticity is negative. Complements price & demand are positively related, cross price elasticity is positive. 
Cross Price Elasticity Formula = percentage change in demand = % ∆ D
 percentage change in price. % ∆ P
Cross Price Elasticity (Splishy Splashy & Raskels) = % ∆ D (raskels
 % ∆ P (splishy splash) 
 = 4/-5 = -0.8 
Cross Price Elasticity (Splishy Splashy & mookies) = % ∆ D (mookies)
 % ∆ P (splishy splash) 
 = -6/-5 = 1.2 
Cross price Elasticity (Splishy Splashy & Raskels) is negative, so they are substitute goods. Cross Price Elasticity (Splishy Splashy & mookies) is positive, so they are complementary goods. 
Splishy Splash & Mookies are complementary goods. So, Mookies are recommended to me marketed with Splishy Splashies.