Solving systems by matrix

Osama starts with a population of 1,000 amoebas that increases 30% in size every hour for a number of hours, h. The expression 1,000 (1+0.3) h finds the number of amoebas after h hours. Which statement about this expression is true?

Karen runs 8 miles in 84 minutes. At the same rate, how many minutes would she take to run 6 miles?

The city's central library has 72,864 books. The library has 72 bookcases. If each bookcase has room for the same number of books, how many books are there in each bookcase?

On the graph of the graph of the equation 3x+2y=18, what is the value of the y-intercept?

Write the ratio of height of the building to the number of floors then find the unit rate explain what is really means in the situation

What is the selling price for a $45 pair of shoes with a 15% markup

What is the answer how does the value of the digit 3 in the number 63,297 compare to the value of the digit 3 in the number 60,325 be sure to include what you know about place value in your answer

A pasta factory made 314.9 pounds of pasta in 4 minutes. How much pasta, on average, did the factory make each minute?

Argot is sewing a ribbon on a seam along the perimeter of a square pillow. The side length of the pillow is 2x2 + 1 inches, and its perimeter is 4 (2x2 + 1) inches. If x = 3.5, how much ribbon does she need?

6.4*10³+5.2*10³ how to solve this?