The wheel shop sells those other kinds of vehicles there are bicycles and go karts in a different room of the shop each bicycle has only one seat each go car has only one seat there are a total of 21 seats and 54 wheels in that room how many are bicycles and how many are go karts

Tracy solved the following problem. which of the statements is true? 9 ÷ 3 + 6 × 2 3 + 6 × 2 9 × 2 18 her answer is correct. her answer is incorrect. she should have multiplied before dividing. her answer is incorrect. she should have multiplied before adding. her answer is incorrect. she should have added before dividing.

Consider a cube that has sides of length l. now consider putting the largest sphere you can inside this cube without any point on the sphere lying outside of the cube. the volume ratio -volume of the sphere/ volume of the cube is 1. 5.2 × 10−1 2. 3.8 × 10−1 3. 1.9 4. 2.5 × 10−1 5. 3.8

In the diagram, gef and hef are congruent. what is the value of x