9. Micsorand dublul unui numar intreg cu 60% din acesta, obtinem 21. Aflati numarul respectiv. 10. Aflati un numar intreg, stiind ca dublul sumei dintre acesta si 1/2 din el este cu 3 mai mica decat -29.

12. Media aritmetica a trei numere intregi este egala cu -33. Daca media aritmetica a primelor doua numere este egala cu -29,aflati cel de-al treilea numar.

Kayla wants to find the width, ab, of a river. she walks along the edge of the river 65 ft and marks point c. then she walks 25 ft further and marks point d. she turns 90° and walks until her location, point a, and point c are collinear. she marks point e at this location, as shown. (a) can kayla conclude that δ and δ are similar? why or why not? (b) suppose de = 15 ft. what can kayla conclude about the width of the river?

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?

Acaterer charges $500 plus $30 per guest to cater a wedding. walt and traci don't want to spend more than $8000 on catering. write and solve an inequality in terms of the number of guests, g, that can be invited. a) 30g ? 8000; g ? 267 b) 500g < 8000; g < 16 c) 500 + 30g < 8000; g < 250 d) 500 + 30g ? 8000; g ? 250