In an arithmitic sequence the tenth term is equal to 28. The sum of term 5 and term 7 is equal to 32. Calculate the sum of the first 50 terms.

Lilianna uses 3/4 calories per minute just by sitting. she uses 1 more calorie per minute by walking. lilianna uses a total of 12 1/4 calories walking to the park. lilianna uses the equation, d(.75+1)=12.25 to represent the situation. what does the variable d represent in the equation?

If the cost to mail a package is an initial $5 and $0.28 for every pound the total cost to mail a package was $11.27, how much did the package weigh?

How are sas and sss used to show that two triangles are congruent?