Pennies used to be made of copper and zinc and had a mass of 3.1g today pennies are made of copper plated zinc and have a mass of 2.5 g. a new pennies mass is what percent of an old pennies mass?

Me! last question, and i'm stuck! write the algebraic expression that models the word phrase. the product of 2 divided by the number h and 8 more than the number k

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

Afarm is to be built in the shape of quadrilateral abcd, as shown below. all four sides are equal. a rhombus abcd is shown with diagonal ac equal to 15.5 feet and diagonal bd equal to 13.2 feet. what is the area of the farm? pleas only pick from the 4 below 62 square feet 52.8 square feet 57.4 square feet 102.3 square feet