Test periodicity and symmetricity of function y=cosx

Susie wants to take her friend out for lunch.she wants to spend $9.75 each person. how much will she spend in all.

Long division setup showing an incomplete calculation. 12 is in the divisor, 6839 is in the dividend, and 5 hundreds and 6 tens is written in the quotient. 6000 is subtracted from 6839 to give 839. an unknown value represented by a box is being subtracted from 839. what number should be placed in the box to complete the division calculation?

During how many months was the difference between the number of days with homework and with no homework greater than 6?