Which situation cannot be represented by this equation? 4x+7=31 options are a: taliba has $31 to order phone cases online. she buys 4 phone cases and pays a $7 shipping charge. what is x, the cost of each phone case? b. taliba is ordering phone cases that cost $4 each online. there is also a $7 shipping charge. if she has $31 to spend, how many phone cases, x, can she buy? c. taliba has $31 to order phone cases online. each phone case costs $7, and there is a $4 shipping charge. how many phone cases, x, can taliba buy?

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X^2/100+y^2/25=1 the length of the major axis is: a)5 b)10 c)20

Mrs. julien’s and mrs. castillejo’s classes are selling cookie dough for a school fundraiser. customers can buy packages of macadamia nut chip cookie dough and packages of triple chocolate cookie dough. mrs. julien’s class sold 25 packages of macadamia nut chip cookie dough and 30 packages of triple chocolate cookie dough for a total of $221.25. mrs. castillejo’s class sold 5 packages of macadamia nut chip cookie dough and 45 packages of triple chocolate cookie dough for a total of $191.25. (a) write the system of equations that model the problem. be sure to explain which equation represents which situation. (b) find the cost of each type of cookie. show your work. (c) explain which method you used to solve the system and why you chose that method.