The percentage 
of children who are able to speak in at least single words by the age of t months can be approximated by the equation.
?
?
By what age are 80% of children speaking in at least single words? Round your answer to the nearest month.
?
A. 10
B. 6
C. 7
D. 15
E. 4
Answer: A
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Use the frequency distribution table to find the mean, median, and mode. If needed, round the mean to one decimal place.
A. mean: 4.7, median: 5, mode: 5 B. mean: 5, median: 5, mode: 5 C. mean: 5, median: 4.5, mode: 2 D. mean: 7.7, median: 7, mode: 7
Write the number in standard notation.4.57 x 107
A. 45,700,000 B. 319.9 C. 4,570,000 D. 457,000,000
Solve and check.7(-1)t = -28
A. t = -7 B. t = -4 C. t = 7 D. t = 4
Solve the problem.Suppose that f(x) = -x - 2 and g(x) = x - 11.(a) Solve f(x) = 0.(b) Solve g(x) = 0.(c) Solve f(x) = g(x).
A. (a) x = -2; (b) x = 11; (c) x = 4.5 B. (a) x = -2; (b) x = -11; (c) x = 4.5 C. (a) x = -2; (b) x = 11; (c) x = -6.5 D. (a) x = 2; (b) x = 11; (c) x = 4.5