Answer:
5) y=5
6)x=7
7)a=18
Step-by-step explanation:
5) y= any number will work. don't add a variable like x
6)x= any number will work. don't add a variable
My work for 7 is in the picture. If you'd like me to explain more for 7 lmk :)
Answer:
0.5hrs
Step-by-step explanation:
Let the speed downhill be
,
Speed uphill is
. We are told than speed uphill is
the speed on flat ground. Therefore the speed on level ground will be
.
From this info, we can obtain the actual speed,
on level ground as:
![x=120m/h\\0.75x=v_g\\\\\therefore v_g=\frac{0.75x \times 120m/h}{x}\\v_g=90m/h](https://tex.z-dn.net/?f=x%3D120m%2Fh%5C%5C0.75x%3Dv_g%5C%5C%5C%5C%5Ctherefore%20v_g%3D%5Cfrac%7B0.75x%20%5Ctimes%20120m%2Fh%7D%7Bx%7D%5C%5Cv_g%3D90m%2Fh)
speed, distance and time have the relation
so to obtain time to cover 45miles:
![t=d/s\\=45/90\\=0.5h](https://tex.z-dn.net/?f=t%3Dd%2Fs%5C%5C%3D45%2F90%5C%5C%3D0.5h)
Hence it takes 0.5hrs to cover 45miles on flat ground.
<u>7x + 3 = 9x - 7</u>
Subtract 7x from each side: + 3 = 2x - 7
Add 7 to each side: 10 = 2x
Divide each side by 2 : <em>5 = x </em>
First: find area of the entire door
15*6=90
then find area of the brown spot:
9*1=9
finally: subtract
90-9=81