0:02 in this video we're going to go over sex
0:05 word problems from the GED math study guide
0:06 guide
0:08 for this first one they give us this
0:10 equation and then they tell us that m is
0:13 the number of megabytes and then T the
0:16 number of seconds but then they tell us
0:19 that the number of megabytes was 791 so
0:21 we know that value right there
0:23 but they're asking how many seconds we
0:26 could plug in for T there to make that
0:28 whole thing 791
0:31 however we already have all of the
0:33 answers so we could just plug them in
0:36 one at a time for T find out which one
0:39 gives us that amount let's do it so
0:44 we've got our 35 plus 18 times let's try
0:46 38 seconds here
0:50 7 19 so not exactly let's clear let's
0:55 try it again this time 35 plus 18 times
0:58 change the T to 42.
1:01 and sure enough 791 so that's the
1:03 correct number of seconds for the download
1:08 Pac-Man uses this expression to find how
1:11 many points you have where D represents
1:14 the number of dots that you eat and G
1:16 the number of ghosts
1:18 how many points did you get if you ate
1:22 196 dots and four ghosts so all we need
1:24 to do is type this into the calculator
1:28 we're just going to change D to 196 and
1:31 G to 4. let's see what that gets us here
1:35 so we got 10 times 196.
1:38 plus 600
1:41 times we ate four ghosts
1:44 43.60 that's the number of points we got
1:49 a pizza has eight toppings available
1:51 they have a special on a two-topping
1:54 pizza how many different combinations of
1:57 two toppings are possible from the eight
1:59 the key word is combinations and you
2:01 always want to start with the total that
2:04 you have but we're choosing two of them
2:07 so you're going to set this up here
2:09 that'll start with the total and this
2:11 button means we're going to choose how
2:13 many combinations of two of them are possible
2:14 possible
2:16 so the way we'll do that is you hit the
2:19 eight the prb button for probability
2:21 down to the NCR
2:26 that'll choose two of them enter 28.
2:27 so therefore there's 28 different
2:30 combinations of two toppings
2:32 another way you could do it is just
2:34 write out eight toppings with eight
2:36 letters and then just keep choosing
2:38 combinations of two of them
2:41 but if you keep doing that all the way
2:47 here we're going to match this phrase
2:50 with one of these ones down here
2:52 now the first part says it's a quotient
2:54 and that always means division so it's
2:56 going to have to be this or this
2:59 fraction here because C and D those are
3:02 multiplied those are products
3:04 and then the next part is 4 less than
3:07 twice a number when you have 4 less than
3:10 it always means minus 4 at the end
3:13 so between these two choices it's got to
3:15 be a right there
3:17 so usually once you find two things
3:21 you've got your answer there
3:23 at a carnival we're playing beer pong
3:26 let's not get it twisted there's 18 cups
3:28 total but eight of them have a special
3:31 prize if you hit it into there
3:33 if you get the ball into one of the 18
3:36 cups what's the probability that it's a
3:37 special cup
3:40 now for probability you could always set
3:42 up a fraction and whatever you're
3:44 interested in goes up top any of the
3:46 eight special cups
3:49 over the total and there's 18.
3:51 and then enter it's just going to
3:53 simplify it down but that actually is
3:58 the probability so 4 over 9 that's it
4:01 all the calculator did is simplify this
4:05 half of 8 4 half of eighteen nine and
4:07 then you can't simplify it anymore so
4:09 you're done there
4:11 and one last one
4:13 whenever you have a function they're
4:15 just going to change the X values to numbers
4:16 numbers
4:18 now they tell us that X is the display
4:21 size in inches and we're going to change
4:23 it to six inches
4:24 in other words we're going to change
4:28 that X and that X to 6. let's do it
4:31 so we'll clear we'll do a 0.5
4:35 parentheses two times six that one
4:41 squared then plus 5 times 6. minus 10.
4:43 close parentheses
4:48 and 782 that is the cost for that phone
4:50 so I hope this gives you more confidence
4:52 with some of these different types of
4:53 word problems here
4:56 let me know what questions you have good
4:58 luck we'll see in the next video doodles
Chrome Extension