In a race, a turtle has a 7km head start, running at hr2km, while a rabbit runs at hr7km. How long until the rabbit catches the turtle? 1. The distance that the rabbit travels is 7+2t. 2. The distance that the turtle travels is 7t. The rabbit races 7+2t km at hr7km for time t.
A researcher randomly selects a vitamin. Define events X (selecting A) and Y (selecting even-labeled vitamins). Arrange a Venn diagram for X, Y, or X∩Y.
A biologist has butterfly specimens of colors G, R, Y and ages 1-6 months. Place dots on a Venn diagram for events A (yellow) and B (older than 2 months).
Classify the following changes as endothermic or exothermic: burning a candle, cooking an egg, rain to snow, boiling water, and the reaction CH4+2O2→CO2+2H2O+heat.
A school needs 5 more desks in secondary classrooms than in elementary ones. With 20 elementary and 25 secondary classrooms totaling 1,115 desks, find the number of desks in each secondary classroom.
Given f(x)=5x+8 and g(x)=x2, find the composite functions and their domains:
(a) f∘g
(b) g∘f
(c) f∘f
(d) g∘g
Find and simplify each expression and state the domain.