Take the 89 times 5 tests. You get 445 total score you need for an average of 89. Add 82, 89, 92, 87=350 445-350=95 They must get a 95 on next test to get the average of 89
Answer:
The temperature will be at 40 degrees by 7:00
Answer:
-263
Step-by-step explanation:
replace x by -9
Answer:
135 minutes
Step-by-step explanation:
Let
y -----> the number of pages to finish reading the book
x ----> the number of hours
we know that
The linear equation in slope intercept form is equal to
![y=mx+b](https://tex.z-dn.net/?f=y%3Dmx%2Bb)
where
m is the unit rate or slope of the linear equation
b is the y-intercept or initial value
In this problem we have
<em>Xanthia</em>
![m=100\ pages/hour](https://tex.z-dn.net/?f=m%3D100%5C%20pages%2Fhour)
![b=225\ pages](https://tex.z-dn.net/?f=b%3D225%5C%20pages)
----> the slope is negative because is a decreasing function
For y=0
substitute and solve for x
![0=-100x+225](https://tex.z-dn.net/?f=0%3D-100x%2B225)
![100x=225](https://tex.z-dn.net/?f=100x%3D225)
---> Xanthia's time to finish reading the book
<em>Molly</em>
![m=50\ pages/hour](https://tex.z-dn.net/?f=m%3D50%5C%20pages%2Fhour)
![b=225\ pages](https://tex.z-dn.net/?f=b%3D225%5C%20pages)
----> the slope is negative because is a decreasing function
For y=0
![0=-50x+225](https://tex.z-dn.net/?f=0%3D-50x%2B225)
![50x=225](https://tex.z-dn.net/?f=50x%3D225)
--- Molly's time to finish reading the book
To find out how many more minutes than Xanthia would it take for Molly to finish reading the book, subtract Xanthia's time from Molly's time
![4.5\ h-2.25\ h=2.25\ h](https://tex.z-dn.net/?f=4.5%5C%20h-2.25%5C%20h%3D2.25%5C%20h)
Convert to minutes
Multiply by 60
![2.25\ h=2.25(60)=135\ minutes](https://tex.z-dn.net/?f=2.25%5C%20h%3D2.25%2860%29%3D135%5C%20minutes)