Andre came up with the following puzzle. “i am three years younger than my brother, and i am 2 years older than my sister. my mom's age is one less than three times my brother's age. when you add all our ages, you get 87. what are our ages? ”

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?

Calculate the average rate of change over the interval [1, 3] for the following function. f(x)=4(5)^x a. -260 b. 260 c. 240 d. -240

Solve the system of equations using the linear combination method. {4x−3y=127x−3y=3 enter your answers in the boxes.