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Asoccer ball manufacturer wants to estimate the mean circumference of soccer balls within 0.1 in

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

At a local museum, the total price for one adult and one child is $11. mrs. smith paid for herself and her three children. she spent $19. record the system of equations to be solved and then find the price of an adult and child ticket using either elimination or substitution.