Write and solve an equation to find the percent increase or decrease. Round your answer to the nearest tenth of a percent, if necessary.By switching service providers, a family's telephone bill decreased from about $50 a month to about $43. What was the percent of decrease?
A.
| 7% |
B. 15%
C. 16.3%
D. 14%
Answer: D
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Solve using Cramer's Rule.Linear systems occur in the design of roof trusses for new homes and buildings. The simplest type of roof truss is a triangle. The truss shown in the figure is used to frame roofs of small buildings. If a 109-pound force is applied at the peak of the truss, then the forces or weights W1 and W2 exerted parallel to each rafter of the truss are determined by the following linear system of equations. Solve the system to find W1 and W2. src="https://sciemce.com/media/4/ppg__tttt0508191537__f1q46g3.jpg" style="vertical-align: -4.0px;" />W1 - 
W1 + 
W2 = 218 
W2 = 0
A. W1 = 97.73 lb; W2= 79.79 lb
B. W1 = 39.9 lb; W2= 48.86 lb
C. W1 = 79.79 lb; W2= 97.73 lb
D. W1 = 109 lb; W2= 133.5 lb
Graph the piecewise linear function.f(x) = 
A. 
B. 
C. 
D. 
Simplify the expression by combining like terms.4y + y - 9y
A. -5y B. -6y C. -4y D. -5y + y
Solve.
x - 
= -6
A. x = -11 B. x = 13 C. x = 11 D. x = -13