Rozwiąż równania:
a) 7x − 28 = 7 b) 5,6 + 3x = −8,8 c) 11x − 7 − 3x = 25

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of

*segment an is an altitude of right ? abc with a right angle at a. if ab = 2root 5 in and nc = 1 in, find bn, an, ac.

Hundred and tens tables to make 430 in five different ways