How do you add matrixs

Tristan wants to buy 12 cupcakes. Each cupcake costs $2.40. What is the best estimate for how much money Tristan should bring with him to pay for cupcakes?

How many liters of spring water are in 6 bottles if each bottle contains 0.33 liter of spring water? Round your answer to the nearest liter.

Solve for the angle. Round to the nearest tenth. COS X = 9/12

How many times do you need to multiply by ten to get from 19.797 to 1979.7

In one hour, William uses a fourth of the time playing on the Wii and a fifth of the time practicing basketball. How much time did he spend playing on the Wii and playing basketball? (Answer must be in a fraction and written in minutes)

There were 149 angelfish and goldfish in an aquarium. There were twice as many guppies as angelfish. After selling 35 goldfish, there are half as many goldfish as angelfish. How many fish are left in the aquarium?

Which statement can be concluded using the true statements? If a quadrilateral has 4 equal sides and 4 equal angles, then it is a square. If a figure is a square, then each of its angles must measure 90 degrees

Maxine works at an amusement park. She recorded the number of ice cream cones sold each day, along with the high temperature in fahrenheit degrees. Usinger her data, she wrote a linear regression equation of y=9x-487.

Running consumes about 720 calories per hour about how many are used if you run for 40 minutes

Convert 160 kilometers to miles (to the nearest tenth).