
Concept explainers
A formula for the nth triangular number
A formula for the nth square number is
A formula for the nth pentagonal number
Using inductive reasoning, a formula for the nth hexagonal number is

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Chapter 4 Solutions
PATHWAYS TO MATH LITERACY- ACCESS CARD
- 15) Solve the triangles if possible. B = 11°, b = 15.5, a = 40.62arrow_forward10) Find the exact value of the expression. tan−1 [tan (~ 7}]] 8arrow_forward12) The point (-15, -8) is on the terminal side of an angle in standard position. Determine the exact values of the three trigonometric functions sine, cosine, and tangent of the angle 0.arrow_forward
- Find the critical value for a left-tailed test using the F distribution with a 0.025, degrees of freedom in the numerator=12, and degrees of freedom in the denominator = 50. A portion of the table of critical values of the F-distribution is provided. Click the icon to view the partial table of critical values of the F-distribution. What is the critical value? (Round to two decimal places as needed.)arrow_forward6) Find the center, foci, and vertices of the ellipse. = 9 49 1arrow_forward1) Find an equation of the parabola with a focus at (0, 4) and directrix the line y = -4, and state the two points that define the latus rectum. A) x² = 16y; latus rectum: (4, 8) and (-4,8) B) x² = 4y; latus rectum: (2, 4) and (-2, 4) C) x² = 16y; latus rectum: (8, 4) and (-8, 4) D) y² = 4x; latus rectum: (9, 2) and (-9, 2)arrow_forward
- 4) A spotlight has a parabolic cross section that is 6 ft wide at the opening and 2.5 ft deep at the vertex. How far from the vertex is the focus? Round answer to two decimal places. A) 0.90 ft B) 0.21 ft C) 0.52 ft D) 0.26 ftarrow_forward5) Match the graph to its equation. 10+ -10 -5 5 + 10 x -10arrow_forwardTo approximate the length of a marsh, a surveyor walks x = 400 meters from point A to point B. Then, the surveyor turns 75° and walks 220 meters to point C (see figure). Approximate the length AC of the marsh. (Round your answer to one decimal place.) m C B 75° 220 m x marrow_forward
- A retractable awning above a patio lowers at an angle of 50° from the exterior wall at a height of y = 11 feet above the ground. No direct sunlight is to enter the door when the angle of elevation of the sun is greater than 70° (see figure). What is the length x of the awning? (Round your answer to two decimal places.) x = ft 7507 Suns rays 70°arrow_forwardhelp and show work plsarrow_forwardTwo ships leave a port at 9 a.m. One travels at a bearing of N 53° W at 10 miles per hour, and the other travels at a bearing of S 67° W at 14 miles per hour. Approximate how far apart they are at noon that day. (Round your answer to one decimal place.) miarrow_forward
- Algebra & Trigonometry with Analytic GeometryAlgebraISBN:9781133382119Author:SwokowskiPublisher:CengageAlgebra: Structure And Method, Book 1AlgebraISBN:9780395977224Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. ColePublisher:McDougal Littell

