The difference between four-fifths of a number and 7 is 5 please help me, and explain step by step

A. 90 degrees b. 45 degrees c. 30 degrees d. 120 degrees

Triangle abc has side lengths: ab = 3.5  cm, bc = 2.4 cm, and ac = 4.2 cmδabc ≅ δhjkwhat is the length of side hj?

Robert is placing sod in two square shaped areas of his backyard. one side of the first area is 7.5 feet. one side of the other area is 5.7 feet. the sod costs y dollars per square foot