If a matrix is not invertible, can i say the matrix has many solutions? or is the matrix has many solutions as well as the possibility or no solutions? and so if a matrix is invertible, the system of equations will definitely only have one unique solution?

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

What is the ratio for the surface areas of the cones shown below, given that they are similar and that the ratio of their radil and altitudes is 4: 3? 23

Ascientist has 50 grams of a radioactive element. the amount of radioactive element remaining after t days can be determined using the equation (1) after two days the scientist receives a second shipment of 50 grams of the same element. the equation used to represent the amount of shipment 2 remaining after t days is 10) - 50 which of the following is an equivalent form of the expression for the amount remaining in shipment 2? what’s the answer?