(too lazy to work it out.) simplify (4.5)(5)(−2). a.) 45 b.) 4.5 c.) -4.5 d.) -45

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0

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

X^2/100+y^2/25=1 the length of the major axis is: a)5 b)10 c)20