Marty and stewart are stuffing envelopes with index cards. they are putting x index cards in each envelope. when they are finished, marty has 15 envelopes and 4 extra index cards and stewart has 12 stuffed envelopes and 6 extra index cards. write an expression in standard form that represents the number of index cards the boys started with.

Which term best describes the association between variables a and b? no association a negative linear association a positive linear association a nonlinear association a scatterplot with an x axis labeled, variable a from zero to ten in increments of two and the y axis labeled, variable b from zero to one hundred forty in increments of twenty with fifteen points in a positive trend.

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

Icould really use some with this question.