25 Math Concepts You Absolutely Need to Know

•  The area of a circle is A = πr², where r is the radius of the circle.

•  The circumference of a circle is C = 2πr, where r is the radius of the circle. The circumference can
  also be expressed as πd, because the diameter is always twice the radius.

•  The area of a rectangle is A = lw, where l is the length of the rectangle and w is the width of the
  rectangle.

•  The area of a triangle is A = ½bh, where b is the base of the triangle and h is the height of the
  triangle.

•  The volume of a rectangular prism is V = lwh, where l is the length of the rectangular prism, w is
  the width of the rectangular prism, and h is height of the rectangular prism.

•  The volume of a cylinder is V = πr²h, where r is the radius of one of the bases of the cylinder and
  h is the height of the cylinder.

•  The perimeter is the distance around any object.

•  The Pythagorean Theorem only applies to right angles and states that c² = a² + b², where c is the hypotenuse of the triangle and
  a and b are two sides of the triangle. 

•  The following are angle measures and side lengths for Special Right Triangles:
  

•  In an equilateral triangle, all three sides have the same length, and each of the angles equals 60°.

•  In an isosceles triangle, two sides have the same length, and the angles opposite those sides are
  congruent.

•  The complete arc of a circle has 360°.

•  A straight line has 180°.

•  A prime number is any number that can only be divided by itself and 1.

•  Squaring a negative number yields a positive result.

•  To change any fraction to a decimal, divide the numerator by the denominator.

•  If two numbers have one or more divisors in common, those are the common factors of the
  numbers.

•  To calculate the mean, or average, of a list of values, divide the sum of the values by the number
  of values in the list.

•  The median is the middle value of a list of numbers that is in either ascending or descending
  order.

•  The mode is the value that appears the greatest number of times in a list.

•  A ratio expresses a mathematical comparison between two quantities. (1/4 or 1:4)

•  A proportion is an equation involving two ratios. (1/4 = x/8 or 1:4 = x:8)

•  When multiplying exponential expressions with the same base, add the exponents.

•  When dividing exponential expressions with the same base, subtract the exponents.

•  When raising one power to another power, multiply the exponents.

Source: Benchprep.com

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How to make your Wordpress site secure

HOSTING

•  Beware cheap ($5-$10/month) shared hosting accounts.
•  Look for hosts with experience hosting WordPress sites.
•  Look for hosts with solid support.
•  Look for hosts that are transparent: who communicate quickly and post issues online.
•  Make sure your host does regular backups that you can access.
•  Call your potential host to find out which versions of Apache web server, MySQL, and PHP they’re running. Check the version release dates with a Google search.
•  Ask your host for written documents containing their server data backup, failover, and update or maintenance policy. If they don’t have them, find another host.
•  Recommended hosts: WP Engine and ZippyKid

HARDENING AND PROTECTING WORDPRESS

•  To harden your WordPress install, follow these steps.
•  Keep WordPress, themes, and plugins up to date. Always. Period.
•  If you’re unsure about how to update WordPress, themes, and plugins, hire someone to do it for you.
•  Backup your site before you update WordPress, themes, and/or plugins.
•  Disable unused user accounts.
•  Never use “Admin” as your username. Ever.
•  Grant users the minimum privilege they need to do their jobs.
•  Require strong passwords.
•  Use 1Password or KeePass to create strong passwords.
•  Use a different, strong password for every site log in.
•  Lock down the WordPress admin dashboard (/wp-admin) using an .htaccess file.
•  Use SFTP to access your web host.
•  Enable SSL on your WP install.
•  Change your passwords once a month. Set a reminder in your calendar if you have to.
•  Do backups. Recommended: BackupBuddy, VaultPress
•  Set file permissions at 644 and 755 for folders.
•  Ensure that the permissions on wp-config.php are not world readable especially in a shared hosting environment.
•  Consider adding HTTP authentication to your /wp-admin/ area.
•  Read Sucuri.net’s blog.
•  Read Google’s security blog. 

CHOOSING THE RIGHT PLUGIN

•  Look for WordPress Plugin API hooks, actions, and filters.
•  Look for properly sanitized data and MySQL statements, unique namespace items, use of the Settings API for any plugin settings or options. 
•  Look for plugins that use nonces instead of browser cookies.
•  Check out how quickly the developer responds to support requests.
•  Check out forum threads to see how well the plugin is supported.
•  Is the developer a known and respected member of the community?
•  Look for a plugin that does one or two tasks really well.
•  If two plugins do similar things, choose the one with the higher download count.

YOU’VE BEEN HACKED. NOW WHAT?

•  Take the site offline. Now. That way you avoid getting a bad rap from search engines and antivirus programs.
•  Let your web host know what happened.
•  Make a full backup of the infected site. It’s helpful for reviewing what happened and in case you mess up something during the repair.
•  Change all of your passwords and the authentication keys in the wp-config.php.
•  Remove any old themes, plugins, and unused code from your server.
•  Update all code on your server. Re-install WordPress so all of the WordPress files are overwritten with fresh copies.
•  Reinstall themes or plugins with fresh copies to make sure no malicious code was inserted. 
•  Check that the file permissions on your files are correct, especially wp-config.php and uploads.
•  Remove the rogue code and make sure you check all sites on your hosting account. There are tools that can help scan and clean the infection such as VaultPress. Exploit  Scanner also scans for certain exploits.
•  If you don’t have the ability to fix the infected files the best thing to do is restore from a recent clean backup.
•  Check your server access logs. Search for any bad file names that you found on your server, patterns passed as query strings, or dates/times that may clue you in to when the attack happened. 

Source: CodePoet.com

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