Answer:
The truck travel must to have a constant speed of ![22.06\ ft/sec](https://tex.z-dn.net/?f=22.06%5C%20ft%2Fsec)
Step-by-step explanation:
we have
![d=1.3t^{2}+t+2](https://tex.z-dn.net/?f=d%3D1.3t%5E%7B2%7D%2Bt%2B2)
where
d expresses a car's distance in feet
t is the number of seconds
<em>Find the distance d for t=8 sec</em>
![d=1.3(8)^{2}+8+2=93.2\ ft](https://tex.z-dn.net/?f=d%3D1.3%288%29%5E%7B2%7D%2B8%2B2%3D93.2%5C%20ft)
<em>Find the distance d for t=8.2 sec</em>
![d=1.3(8.2)^{2}+8.2+2=97.612\ ft](https://tex.z-dn.net/?f=d%3D1.3%288.2%29%5E%7B2%7D%2B8.2%2B2%3D97.612%5C%20ft)
The total distance in this interval of 0.2 sec is
![97.612-93.2=4.412\ ft](https://tex.z-dn.net/?f=97.612-93.2%3D4.412%5C%20ft)
<em>Find the speed of the car</em>
Divide the total distance by the time
![4.412/0.2=22.06\ ft/sec](https://tex.z-dn.net/?f=4.412%2F0.2%3D22.06%5C%20ft%2Fsec)
therefore
The truck travel must to have a constant speed of ![22.06\ ft/sec](https://tex.z-dn.net/?f=22.06%5C%20ft%2Fsec)
75% of n is 375.
Step-by-step explanation:
Given,
45% of a number n = 225
We will find n first.
![\frac{45}{100}n=225\\0.45n=225](https://tex.z-dn.net/?f=%5Cfrac%7B45%7D%7B100%7Dn%3D225%5C%5C0.45n%3D225)
Dividing both sides by 0.45
![\frac{0.45n}{0.45}=\frac{225}{0.45}\\n=500](https://tex.z-dn.net/?f=%5Cfrac%7B0.45n%7D%7B0.45%7D%3D%5Cfrac%7B225%7D%7B0.45%7D%5C%5Cn%3D500)
Now we have to find 75% of n.
75% of n = ![\frac{75}{100}*500=75*5](https://tex.z-dn.net/?f=%5Cfrac%7B75%7D%7B100%7D%2A500%3D75%2A5)
75% of n = 375
75% of n is 375.
Keywords: percentage, division
Learn more about percentages at:
#LearnwithBrainly
Answer:
Yes
Step-by-step explanation:
the X doesn't repeat
-2 x 1 y = -1
Find the slope of this line
make y the subject
1 y = 2 x -1
Divide by 1
y = 2 x -1
Compare this equation with y=mx+b
slope m = 2
The slope of a line parallel to the above line will be the same
The slope of the required line will be 2
m= 2 ,point ( 2 , -2 )
Find b by plugging the values of m & the point in
y=mx+b
-2 = 4 + b
b= -6
m= 2
Plug value of the slope and b in y = mx +b
The required equation is y = 2 x -6
Let's say you have 20 friends over. 6 more are coming over. And they all want 3 slices of pizza.
So to figure out how many slices of pizza you would need, you'd use this equation: 3•(20+6)