If three times the sum of two, numbers is 45 and five times their difference is 20 find the numbers

Ineed , i need to create a power point in life science here is a picture explaining a little what the topic is about, me with some information for my slides : (

4. what are three safety guidelines every hunter should follow when handling a firearm?

Which of the following would not be considered a geographic impact on the history of middle and south america? a. the relative geographic isolation of the americas meant that they would be more susceptible to european diseases. b. ernesto “che” guevara's trip throughout south america inspired him to become a revolutionary. c. the tropical climate of north america has encouraged many south american countries to produce goods there. d. the proximity of the united states to middle and south america has strengthened its relationship to the region.