Prepare for Mathematics Problems

Introduction to prepare for mathematics problems:

Mathematics is the study of the dimension, properties, and interaction of quantities and sets, using symbols and numbers. Mathematics is used in our daily life. Mathematics includes algebra, geometry, calculus, etc. Step by step explanation is very useful to understand the concepts of math. Now, we are going to prepare for mathematics problems.

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Problems to prepare mathematics:


Example problem 1:

Solve an equation for the variable r:` (r / 4)` - 28 = -33

Solution:

`(r / 4) ` - 28 = -33

Add 28 on both sides of the equation

`(r / 4) ` – 28 + 28 = - 33 + 28

`(r / 4) ` = -5

Multiply 4 on both sides of the equation

`(r / 4)` * 4 = -5 * 4

r = -20

So, r = -20 is the solution of the given equation.

Example problem 2:

Solve the inequality: 2r – 83 < -61

Solution:

2r – 83 < -61

Add 83 on both side of the inequality

2t – 83 + 83 < -61 + 83

2r < 22

Divide by 2 on both side of the inequality

`(2r) / 2 < 22 / 2`

r < 11

So, the solution is (-infinity, 11).


Few more problems to prepare mathematics:


Example problem 3:

Find the x and y intercept of the equation: 7x + 3.5y = 14.

Solution:

7x + 3.5y = 14

To find the x intercept value, plug y = 0 in the given equation

7x + 3.5(0) = 14

7x = 14

x = 2

So, the x intercept is (2, 0).

To find the y intercept value, plug x = 0 in the given equation

7(0) + 3.5y = 14

3.5y = 14

y = 4

So, the y intercept is (0, 4).

Example problem 4:

Find the area of trapezoid whose parallel sides are 10cm and 7cm and height is 8cm.

Solution:

Base 1 = 10cm

Base 2 = 7cm

Height = 8cm

Area of trapezoid = `(1 / 2)` h(a + b)

= `(1/2)` (8) (10 + 7)

= 68cm^2.

So, the area of trapezoid is 68cm^2.

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Practice problems to prepare mathematics:


1)      Solve for the variable d:  10d + 4 = 18 + 3d (Answer: d = 2).

2)      Solve for the variable r:  18r + 1 = 37 (Answer: r = 2).

3)      Find the area of trapezoid whose parallel sides are 9cm and 6cm and height is 5cm. (Answer: 37.5cm^2).