Basic Aptitude Test On Math And Biology! Quiz

Explanation
To solve for n, we need to isolate the variable. We can do this by dividing both sides of the equation by 4, since 4 is multiplied by n. This gives us n = 7. Therefore, the value of n that satisfies the equation 4n = 28 is 7.

Explanation
The given equation is a + b - c = 4 + 9 - 5 = 8.

Explanation
To solve the expression 3a + 7, we substitute the given values of a, b, and c into the expression. Since a is given as 4, we have 3(4) + 7. Simplifying this expression, we get 12 + 7 = 19. Therefore, the correct answer is 19.

Explanation
There are four different types of joints.

Explanation
The correct answer is Hinge, Immovable, Pivot, Ball and Socket. These are the different types of joints found in our body. A hinge joint allows movement in only one direction, like the movement of a door on its hinges. An immovable joint, also known as a fixed joint, does not allow any movement, such as the joints between the bones of the skull. A pivot joint allows rotational movement, like the movement of the head on the neck. A ball and socket joint allows for a wide range of movement in all directions, like the movement of the hip and shoulder joints.