If you deposit 1000 in a savings account with an intrest rate of r compounded annually then the balance in the account after 3 years is given by the function b(c)=1000(1+r) where is r written as a decimal?

Given a: b and b: c, find a: b: c. write the ratio in simplest form. a: b=6: 10 and b: c=21: 33

How do i multiply two digit numbers

The pyraminx is a rubik's cube-type toy in the shape of a tetrahedron. the pyraminx shown below has edges 15\,\text{cm}15cm long and vertical height h=12.2\,\text{cm}h=12.2cm. the triangle drawn with dashed lines is a right triangle. what is the distance rr? round your answer to the nearest tenth.