Answer:
Answer 3.59
Step-by-step explanation:
Remark
This is called an extraneous information question. That means you have a piece of information you don't need. You'll get a lot of these in math courses yet to come. The piece of information you don't need is 79.95.
All you need are the other two numbers.
Givens
sale price= 62.79
Pocket money = 59.20
Formula
Amount needed = Sale price - Pocket money
Solution
Amount needed = 62.79 - 59.20
Amount needed = 3.59
In any triangle, the sum of the angles is always 180 degrees
So 105 + 40 + x = 180
145 + x = 180
x = 180 - 145
x = 35 degrees
So for this question (for finding x and y) you will want to use elimination. To do this you will need to bring the x and y to the same side (I put them on the left):
-3/2x+y=6
x+y=0
Now subtract the y on the bottom from the top to isolate x:
3/2x=6
Now the easiest way to bring over the 3/2 to isolate the x fully is to convert it to decimal (1.5) and divide it by 6 (because when multiplication on one side of problem the only way to bring it over is to divide):
x=6/1.5
which simplifies to:
x=4
Hope this helps!
Answer:
Sarah is 60 years old
Step-by-step explanation:
64 divided by 4 is 16. Add 16 to 44 to get Sarah's age, 60
