Real numbers - math problems
Number of problems found: 111
- Evaluate 18
Evaluate the expression (-4-7i)-(-6-9i) and write the result in the form a+bi (Real + i* Imaginary).
- The sum 15
The sum of the real numbers x and y is 24. Their difference is 12. What is the value of xy?
- Sum and product
The sum of the real numbers x and y is 12. Their difference is 8. What is the value of xy?
- Bubble bee marbles
Mark has 100 marbles. Seventeen are bubble bee marbles. What decimal number shows the fraction of marbles that are bumblebees?
Items Acosts 675.35 while item B costs 1605.25. by how much more was the cost of item B than item A. If item A and B will be purchased, how much would are pay?
- Sorting ASC
Which group of decimals is in order from least to greatest? A) 1.04, 0.39, 0.8, 2.1, 0.09 B) 2.1, 1.04, 0.39, 0.8, 0.09 C) 0.09, 0.39, 0.8, 1.04, 2.1 D) 0.09, 0.39, 0.8, 2.1, 1.04
- The sum 10
The sum of three decimals are 938.629. Two of them are 456.54 and 392.69. Find the third one.
- An aquarium
An aquarium tank that measures 2.4 m high, 6 m long, and 1.5 m wide and is completely filled with water. The density of water is 1,000 kg/m3. What is the mass of the water in the tank?
- Josh works
Josh works mowing lawns and babysitting. He earns $7.20 an hour for mowing and $6.80 an hour for babysitting. How much will he earn for 1 our of mowing and 6 hours of babysitting?
Mohammad sells beaded necklaces. Each large necklace sells for $4.50 and each small necklace sells for $4.10. How much will he earn from selling 5 large necklaces and 4 small necklaces?
- ZOO 2
Valerie bought tickets to the zoo for the family. She bought 3 adult tickets for $9.50 each and 2 children's tickets for $4.50 each. How much did the tickets cost Valerie in all?
- A bottle 2
A bottle contain 255 coins 1/3 of the coins are £1 cons 110 of the coins are 50p coins the rest of the coins are 20p coins. What is the total value of the coins contained in the bottle.
- Fruit punch 2
Alberto makes fruit punch with 24.2 ounces of apple juice and 18.4 ounces of pineapple juice. He splits the fruit punch equally into 6 glasses. How much fruit punch is in each glass?
- Subtract 4
Subtract the following decimals. a. 0.98 - 0.053 b. 0.67 - 0.4 c. 0.3 - 0.002 d. 3.2 - .789 e. 6.53 - 4.298 f. 6 - 4.32 g. 7 - 3.574 h. 4.83 - 1.8 i. 3.7 - 1.8 j. 16.17 - 11.632
Grayson bought snacks for his team's practice. He bought a bag of oranges for $3.11 and a 24-pack of juice bottles. The total cost before tax was $50.15. How much was each bottle of juice?
- Potato Chips
Haydn has a 3 pound bag of Lay’s Potato Chips. His four friends want him to split the bag evenly between all of them (and Haydn). How many pounds of Lay’s potato chips will each person get?
Brian divides 80 by 7. Between what two whole numbers is his answer?
- The diameter 2
The diameter of the Earth is 12,756 kilometers. If Mercury's diameter is about 7,876.6 kilometers shorter than that of the Earth, what is the diameter of Mercury?
- Copper winding
Calculate the current flowing through the copper winding at an operating temperature of 70°C. Celsius, if the winding diameter is 1.128 mm and the winding length is 40 m. The winding is connected to 8V.
- Open intervals
Open intervals A = (x-2; 2x-1) and B = (3x-4; 4) are given. Find the largest real number for which A ⊂ B applies.