Customers at costco spend an average of $130 per trip (the wall street journal, october 6, 2010). one of costco's rivals would like to determine whether its customers spend more per trip. a survey of the receipts of 25 customers found that the sample mean was $135.25. assume that the population standard deviation is $10.50 and that spending follows a normal distribution. use standard normal curve area table. a,specify the appropriate null and alternative hypotheses to test whether average spending at the rivals store is more than $130.b. calculate the value of the test statistic. c.calculate the p-value. d. calculate the critical value

the area of a triangle is determined by the formula: base x height * 1/2

you'll need to assign a base to the triangle. based on the vertices given, the simplest base would be the line segment from (-2,1) to (2,1). the distance between any two numbers is found by just subtracting them. here, you should subtract the x values to find the distance of this side.

2 - (-2) = 4.

so the distance (aka the length of the base) is 4. the height of the triangle is the distance between the base and the highest point on the triangle which is (3,4). we should subtract the y values this time to find the height/distance.

4 - 1 = 3

so the height is 3.

base = 4

height = 3

hope this if needed hmu