The shark swims 80 ft/min and the current is 50 ft/min. The shark swims 400 ft/min and the current is 100 ft/min ii.
Evaluate the expression in part (a) if: i. Then write two expressions, one for the distance the sharks swims out and the other for the distance it swims back. Define variables for the shark s speed through the water and for the speed of the current (the speed at which the water is moving). Later, it returns against the current, taking 30 minutes. A shark takes 20 minutes to swim with the current from its cave to the feeding grounds. As a decimal to the nearest tenth, how many 2 square inches are in the area of the triangle with sides of length 4, 5, and 6 inches? 6. Heron s formula (sometimes called the semi-perimeter formula) says that if a triangle has sides lengths a, b, and c, then the area of the triangle is given by (a A = s (s - a)(s - b)(s - c) where s + b + c) =. Use the expression to evaluate the total cost to buy a 28-foot rope at $.23 per foot and a 36-foot rope at $.39 per foot. Write a variable expression using 4 variables to represent the cost of 2 ropes that have different lengths and price per foot. The cost of rope at hardware store depends on its length in feet and its price per foot. Express your answer as a common fraction. If a = 4.9 and b = 1 9 5, determine the value of the reciprocal of b/a.
Then find the number of kilometers the dolphin travels in 3 hours. Evaluate 3ab! for a " 2, b " 5, and c " Write an expression for the number of kilometers a dolphin travels in h hours swimming at 8 km/hr. 1 Tiered Problems for a Variety of Middle School Math Topics Lesson Topic Grade 7 Page Evaluating Expressions 3 Prime Factorization, Greatest Common Factor and Simplifying Fractions 5 Applying fraction operations in context 7 Applying proportions 9 Solving multi-step equations 11 Areas of polygons 13 Lesson Goal Grade 8 Page Evaluate Expressions 15 Problem Solve with Linear Equations 17 Solve Distance, Rate, Time problems 19 Analyze Change in Various Contexts (Interpret Story Graphs) 23 Graph a linear function by using a table of values 25 Graph horizontal and vertical lines 27 Calculate the slope between two points on the coordinate plane 29 Problem Solve with Graphs of Linear Functions 31 Apply Linear Systems of Equations 33 Graph Quadratic Functions 35 Apply Exponential (Growth) Functions 37 Apply the Pythagorean Theorem 39 1ģ 7 th Grade Unit: Algebraic Expression and Integers Lesson: Evaluating Expressions Goal: Students evaluate variable expressions by substitution and solve word problems by evaluating expressions.
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