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How To: Solve word problems with proportions

In this video the instructor shows how to use proportions to solve fractions. When you have a proportions problem with an unknown term, cross multiply and divide it to get the value of that unknown term. For example if given 7/8 = m/4, cross multiply 7/8 with 4, giving 7/2 which is the value of the unknown variable m. So if two quantities are proportionate then you can equate them as shown in the video and cross multiply to get the value of any unknown variable. Proportions are just fractions...

How To: 8 States Support Digital Driver's Licenses in Apple Wallet — Which States Are Next?

Apple announced support for mobile driver's licenses and state identification cards in Apple Wallet back in 2021, and Arizona was the first state to jump on board in 2022. Fast forward to now, and only eight states let you add a driver's license or state ID to Apple Wallet on your iPhone and Apple Watch. It has been a slow rollout, but more states are coming or are at least showing interest.

How To: Solve percent equations

In this tutorial the instructor shows how to solve percent equations. The general form of a percent equations is that a is b% of c. As there can be three kinds of variables a, b, c, the questions involving percent equations can be of three types having one of the three variables unknown. These kind of percent statements can be solved easily by setting up an equation. So, to convert percent statement into a equation replace the unknown term with n, the 'is' term with equals sign and the '%' si...

How To: Solve direct proportions

You can solve any proportion using the fundamental rule of proportions. First you must build the proportion if you are given a word problem. Decide using logic whether it is a direct proportion (more on one side means more on the other). If so, find the parts of the equation that use the same units and make a fraction with these, putting the smaller number on top. The number left over is linked with one of the other two numbers in the fraction--use logic to figure out which. Put it in the sam...

News: Meet Samsung's Crazy, Innovative & Flawed Galaxy Fold

After years of rumors and waiting, Samsung's first foldable smartphone is finally a reality. The phone itself is a bit wild, but with Samsung going so far out of their comfort zone with this one, there were some bumps in the road that caused a delayed release. The launch has been pushed back yet again, but when it does hit stores, it could end up being one of the most influential devices in years.

How To: Find critical values with T functions in MS Excel

If you use Microsoft Excel on a regular basis, odds are you work with numbers. Put those numbers to work. Statistical analysis allows you to find patterns, trends and probabilities within your data. In this MS Excel tutorial from everyone's favorite Excel guru, YouTube's ExcelsFun, the 91st installment in his "Excel Statistics" series of free video lessons, you'll learn how to use TINV and TDIST functions to find critical values given an unknown sigma value.

How To: Find a missing angle in a parallelogram

Could you use a little help figuring out how to find an unknown angle in a paralellogram? Watch this free video geometry lesson. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just finish your homework or study for that next big test). With this free math tutorial, you'll learn how to calculate a missing angle in ...

How To: Use differential equations to solve for velocity

The guy first gives the definition of differential equations. He explains that a differential equation is an equation that contains the derivatives of an unknown function. He then gives some examples of differential equation and explains what the equation's order means. After that he gives an example on how to solve a simple equation. He calculates it and gives examples of graphs. Then he explains what a general solution is and how to narrow down the number of solutions using data from the pr...

How To: Find a missing coordinate given: coordinate & equation

In this video, the instructor shows how to find an unknown coordinate given the other coordinate of that point and the equation that passes thought the point. A point is said to lie on the graph, if the point can satisfy that equation of the line. To check if a particular point satisfies an equation, all you have to do is substitute the value of the point in that equation and check if it validates the equation. Now, substitute the given point with an unknown coordinate in that equation. If th...

How To: Solve radical equations in algebra

The video demonstrates the solving of radical equations in algebra. The first thing to be done is to keep the radical number on one side and the other numbers on the other side. The radical is then changed to a rational number by squaring, cubing etc. Once the roots are removed, it becomes a simple equation which can be solved by keeping the unknown number on one side and the rest of the numbers on the other side. The value, thus arrived at, is checked by putting the value of the unknown numb...

How To: Convert units

In this tutorial the instructor shows how to convert lengths between different units. He show a two step approach where in the first step he setups a relation between centimeters and meters showing that 100 cm equals 1 meter. Now he writes it down in a fraction form and equates it to another similar centimeter upon meter fraction where the value in meters in unknown. Now he cross multiplies and solves the fractions giving the result of the unknown meters. This video clearly explains how to co...

How To: Find a missing part of a triangle, similar to another

In this tutorial the author shows how to find out the missing part of a triangle that is similar to another triangle. He explains the concept of similar triangle diagrammatically by showing that similar triangles have similar angles and parallel sides. Now he labels sides of similar triangles and marks the value of unknown side as variable x. Now in similar triangles as the lengths of sides of proportionate he shows how to write a equation of proportion and solves it finding the missing part ...

How To: Solve for ratios and proportions

In this tutorial the instructor shows how to solve ratios and proportions. He gives a two step approach to solve an equality of two fractions in which the value of a variable in unknown. He says that in the first step we should cross multiply the numbers across the diagonal. In the second step we need to divide and simplify to get the value of the unknown variable. This video gives a simple two step method on how to solve ratios and proportions.

How To: Solve a system of linear equations by substitution

System of equations is nothing but a system which contains more than one linear equations. This system of equations can be solved to arrive at the solution of the system. A simple system of the linear equations can be a pair of equations. To solve this kind of system you can employ the substitution method. So take the two equation of the system. Solve for the value of y in the first equation in terms of x. Now take this value of y and substitute in the second equation y value. Now the second ...

How To: Easily enter a destination on the Garmin Nuvi 750

Garmin is a popular and trusted brand of GPS devices. In this video, learn how to enter destinations and perform other basic tasks with a Garmin Nuvi 750. This video shows you the Nuvi 750 but all of the instructions should also work with other Garmin models. GPS is fantastic for traveling to new destinations, getting out of a lost situation and finding unknown places faster.

How To: Clear the check engine light on your dashboard

In this tutorial, we learn how to clear the check engine light on your dashboard. This could be caused from an over-boost from the turbo charger that the engine does not recognize. The solution is to grab a tuner device and plug it into the car. Wait for it to power up, then go to the main menu. After this, go to "read dtc's", then find the trouble codes. It will show you what unknown codes are coming up, then you can clear them by pressing the "s" key. Now your light should turn off and you ...

How To: Search YouTube more efficiently with search operators

Searching YouTube is tough, because there's a plethora of content, so sometimes i's best to do an advanced search. This is not to be confused with the "search options" available during a YouTube search query, because those are limited to key features of YouTube, but not specific search terms. Much like Google, you can search YouTube via search operators. Many of the same search operators that work on Google work on YouTube also. Filter your results the way you want, not the way they want. You...

How To: Block your outbound caller ID number

Jim from the "My Temp Number Helpline" teaches us to block outbound caller ID on your phone. The first way to do this is to open up the dial pad and enter *67 before the number you want to dial. This will show up on the receiving line as "Private Number" or "Unknown". To permanently block the number you go into your phone's settings. Then click on the word phone. Then click where it says "Show my caller id". If this setting is off, then your number is blocked on all outbound calls. This is us...

How To: Draw a eye using easily

An unknown artist demonstrates step by step how to draw a realistic eye in this video. She first begins with lightly drawing the eyes shape, starting with the upper lid and gradually beginning to darken the line once she is satisfied with the shape an contour. She then draws the upper lid and continues on to the iris, pupil, and cornea. Then she works on shading the eye, drawing the lashes, and then using the eraser to remove any stray lines and whiten certain areas. Then, she begins drawing ...

How To: Factor a trinomial

In this video the instructor shows how to factor a general quadratic polynomial. Here the first step is to identify the coefficient of the squared term. Write the reciprocal of the numerical coefficient of the squared term out side and write two separate parenthesis which are going to contain the binomials which are the factors of the original equation. The first term of both the binomials is the first term numerical coefficient times the unknown variable. Now multiply the first term numerica...