def polynomial_function_find_negative():
max_coeff_abs = 144
min_degree = 2
max_degree = 5
degree = randint(min_degree, max_degree)
coeffs = around(random.rand(6) * (max_coeff_abs * 2)) - max_coeff_abs
x = symbols('x')
# f(x)
expr = 0
# f(-x)
neg_expr = 0
# arange is half open; it doesn't include the top value, so we add 1
for i in arange(degree - 1) + 1:
coeff = Rational(coeffs[int(i)])
power = Rational(degree - i)
expr += coeff * (x)**power
neg_expr += coeff * (-x)**power
question = fmath("f(x) = " + latex(expr))
answer = fmath("f(-x) = " + latex(neg_expr))
return create_full_text_problem([question], [answer])
def addition_integers(length=2, low=1, high=10) -> Problem:
length = int(length)
low = int(low)
high = int(high)
if length < 2:
raise ValueError("addition problem must have length of 2")
if low > high:
raise ValueError("max must be greater than or equal to min")
equation = ""
sum = 0
for i in range(length):
value = random.randrange(low, high)
equation += str(value)
sum += value
if i < length - 1:
equation += "+"
problem_value = fmath(equation)
solution_value = "\\({}\\)".format(sum)
problem_widget = Widget(build_text_widget_options(problem_value))
solution_widget = Widget(build_text_widget_options(solution_value))
return Problem([problem_widget], [solution_widget])
def quadratic_function_find_vertex_intercept_form():
# We may want to include fractions for more difficult problems in the future
min_c = 1
max_c = 6
min_n = 1
max_n = 30
min_a = 1
max_a = 5
c = randint(min_c, max_c)
n = randint(min_n, max_n)
a = randint(min_a, max_a)
c = -c if rand() < 0.5 else c
x = symbols('x')
expr = a * (x + c)**2
# Expand into standard form
expr = expand(expr)
# Remove c^2
expr = expr - a * c**2
# Add n
expr = expr + n
eval_expr = a * (x + c)**2 + n - (a * (c**2))
problem_instruction = "Find vertex "
problem_expr = fmath(latex(expr) + ' = 0')
problem_solution = fmath(latex(eval_expr) + ' = 0')
return create_full_text_problem([problem_expr], [problem_solution])
def compound_interest_continuous_find_effective_roi():
r = randint(1, 15) / 100
r_e = f_effective_rate_of_interest_continuous(r)
problem_instruction = "Find the effective return on investment for this investment (round to 3 decimal points):"
problem_text = f"For {fmath(fper(r))} compounded continuously"
solution_text = fmath(fper(r_e))
return create_full_text_problem(
[problem_instruction, problem_text], [solution_text]
)
def compound_interest_discrete_find_effective_roi():
n = choice(compounding_n_choices)
r = randint(1, 15) / 100
r_e = f_effective_rate_of_interest_discrete(r, n)
problem_instruction = "Find the effective return on investment for this investment (round to 3 decimal points):"
problem_text = f"For {fmath(fper(r))} compounded {compounding_choices[n]}"
solution_text = fmath(fper(r_e))
return create_full_text_problem(
[problem_instruction, problem_text], [solution_text]
)
def compound_interest_continuous_find_p():
a = 50 * randint(1, 21)
t = randint(1, 3) + choice([0, 0.5])
r = randint(1, 15) / 100
p = round(f_present_value_continuous(a, r, t), 2)
plural_end = "s" if t != 1 else ""
problem_instruction = "Find the present value of this investment:"
problem_text = f"To get {fmath(fcur(a))} after {fmath(ffrac(t))} year{plural_end} at {fmath(fper(r))} compounded continuously"
solution_text = fmath(fcur(p))
return create_full_text_problem(
[problem_instruction, problem_text], [solution_text]
)
def compound_interest_discrete_find_p():
a = 50 * randint(1, 21)
n = choice(compounding_n_choices)
t = randint(1, 3) + choice([0, 0.5])
r = randint(1, 15) / 100
p = round(f_present_value_discrete(a, r, n, t), 2)
year_word = fplural("year", "years", t)
problem_instruction = "Find the present value of this investment:"
problem_text = f"To get {fmath(fcur(a))} after {fmath(ffrac(t))} {year_word} at {fmath(fper(r))} compounded {compounding_choices[n]}"
solution_text = fmath(fcur(p))
return create_full_text_problem(
[problem_instruction, problem_text], [solution_text]
)
def compound_interest_discrete_find_a():
p = 50 * randint(1, 21)
n = choice(compounding_n_choices)
t = randint(1, 3) + choice([0, 0.5])
r = randint(1, 15) / 100
a = f_compound_interest_discrete(p, r, n, t)
year_word = fplural("year", "years", t)
problem_instruction = "Find the amount that results from this following investment:"
problem_text = f"{fmath(fcur(p))} invested at {fmath(fcur(r))} compounded {compounding_choices[n]} after a period of {fmath(ffrac(t))} {year_word}"
solution_text = fmath(fcur(a))
return create_full_text_problem(
[problem_instruction, problem_text], [solution_text]
)
def sum_consecutive_integers(integer_count: bool = None, max_initial_integer: int = 50) -> Problem:
if integer_count is not None and integer_count < 2:
raise ValueError('parameter integer_count on sum_consecutive_integers must be greater than or equal to 2')
integer_count = integer_count if integer_count is not None else Random().randint(3, 5)
base_integer = Random().randrange(0, max_initial_integer)
final_integer = 0
for i in range(integer_count):
final_integer += base_integer + i
nth_integer_to_find = Random().randint(1, integer_count)
ordinal_number = ford(nth_integer_to_find)
question_label = f"The number {fmath(final_integer)} is the sum of {fmath(integer_count)} consecutive integers. What is the {ordinal_number}?"
solution_integer = base_integer + (nth_integer_to_find - 1)
solution = fmath(solution_integer)
return create_full_text_problem([question_label], [solution])
def formatted_interval_from_continuous(values):
interval = interval_from_continuous(values)
interval_string = '[{}, {}]'.format(interval[0], interval[1])
interval_formatted = fmath(interval_string)
return interval_formatted
def find_trig_func_arc_inverse_with_calculator():
problem_instruction = "Use a calculator to find the value of this expression rounded to two decimal places:"
functions = {
"arccsc": ("csc", lambda x: arcsin(1 / x), True),
"arcsec": ("sec", lambda x: arccos(1 / x), True),
"arccot": ("cot", lambda x: arctan(1 / x), False),
}
function_keys = list(functions.keys())
picked_function_key = function_keys[randint(0, len(function_keys))]
picked_function = functions[picked_function_key]
picked_function_has_gap = picked_function[2]
number_types = ["fraction", "sqrt", "whole"]
picked_number_type = choice(number_types)
picked_number = None
fraction_range = (-4, 4)
sqrt_range = (1, 10)
whole_range = (-10, 10)
def pick_number():
if picked_number_type == "fraction":
# denominator shouldn't be 1
denominator = choice([
randint(fraction_range[0], -1),
randint(2, fraction_range[1] + 1)
])
denominator_sign = 1 if denominator >= 0 else -1
if picked_function_has_gap:
numerator = denominator_sign * (abs(denominator) + 1)
else:
numerator = denominator_sign * (abs(denominator) +
choice([-1, 1]))
fraction = Fraction(numerator, denominator).limit_denominator()
# simplify
numerator = fraction.numerator
denominator = fraction.denominator
return (numerator / denominator, ffrac(numerator, denominator))
elif picked_number_type == "sqrt":
square = randint(sqrt_range[0], sqrt_range[1])
return (square**0.5, f"\sqrt{{{square}}}")
elif picked_number_type == "whole":
whole_number = choice(
[randint(whole_range[0], 0),
randint(1, whole_range[1] + 1)])
return (whole_number, str(whole_number))
picked_number = pick_number()
answer = around(picked_function[1](picked_number[0]), 3)
problem_text = fmath(f"\{picked_function[0]}^{{-1}}({picked_number[1]})")
solution_text = fmath(str(answer))
problem = build_gen_problem_content([problem_instruction, problem_text],
[solution_text])
# if env.is_debug():
# debug_info = [
# {"picked_number_type": picked_number_type},
# {"picked_function": picked_function_key},
# {"picked number": picked_number},
# ]
# return DebugProblemWrapper(debug_info, problem)
return problem
