#4. I get 88.5 meters. Typo in the formula?
#7 y=x+6
#9 (-3,-4) and (2,6)
#13 Reaches a maximum height of 549 feet after 5.75 seconds
#14 no idea, since no graph here
#19 225/4
#20 1.1, -9.1
#21 -10.35, 1.35
The others look good (despite a few typos in the problems)
Could you guys check my answers?
1. Graph the function and identify the domaine and range. y=-1.5^2
Domain; (-,+)
Range; (-,0) ( my answers.)
2.How is the graph of y=-2x^2-5 different from the graph of y=-2x^2
It is shifted units up
it is shifted 5 units down <---
It is shifted 5 units left
It is shifted 5 units right.
3. A model rocket is launched from a roof into a large field. The path of the rocket can be modeled by the equation y=-0.04x^2+8.3x+4.3, where x is the horizontal distance, in meters from the starting point on the roof and y is the height in meters,of the rocket above the ground. How far horizontally from its starting point will the rocket land? Round your answer yo the nearest hundredth meter.
208.02 m<-----
416.03 m
0.52 m
208. 19 m
4.Landon is standing in a hole that is 6.5 m deep. he throws a rock, and it goes up into the air, out of the hole, and then lands on the ground above. The path of the rock can be modeled by the equation y=-0.05x^2+4.5x-6.5, where x is the horizontal distance of the rock, in meters, from landon and y is the height, in meters, of the rock above the ground. How far horizontally from landon will the rock land? Round your answer to the nearest hundredth of a meter.
a. 18.07 m <----
b. 35.96 m
c. 9.04 m
d. 71.93 m
5. How many real number solutions does the equation have? -7x^2+6x+3=0
one solution
two solution <---
No solution
infintely many solutions
6. How many real number solutions does the equation have? y=2x^2-20x+50
one solution <---
Two solutions
no solutions
infinetely solutions
7. Graph the set of points, which model is most appropriate for the set. (-6,0) (-4,2) (-3,3) (2,8)
Linear +
quadratic +
Linear-
Quadtratic - <---
9. y=x^2+3x-4
y=2x+2
(-3,6) and(2,-4)
(-3,-4) and (2,6)
(-3,-4) and (-2,-2) <----
No solution
10. y=x^2+8x+2
y=7x+4
(-2,-10) and (1,11) <----
(2,10) and (-1,-11)
(-2,-34) and (1,11)
11. If an object is dropped from a heigh of 144ft, the function h(t)=-6t^2+144 gives the heigh of the object after t second. when will the ball hit the ground?
1.5 s
3 s <--
6 s
9 s
12.A ball is thrown into the air with an upward velocity of 28 ft/s. its height in feet after t seconds is given by the function h=-16t+28+7. how long does it take the ball to reach its maximum height? What is the balls maximum height? Round to the nearest hundredth.
Reaches a maximum height of 7 feet after 1.75 seconds
Reaches a maximum height of 43.75 feet after 0.88 seconds
Reaches a maximum height of 17.5 feet after 0.88 seconds
Reaches a maximum height of 19.25 feet after 0.88 seconds <---
13. A catapult launches a boulder with an upwark velocity pf 184 feet per second. the heigh of the boulder in feet after t seconds is given by the function h(t)=-16t^2+184t+20. how long does it take the boulder to reach its maximum height? What is the boulders maximum height? Round to the nearest hundredth.
Reaches a maximum height of 11.6 feet after 5.75
Reaches a maximum height of 549 feet after 11.5 seconds
Reaches a maximum height of 549 feet after 5.75 seconds
Reaches a maximum height of 23.2 feet after 11.6 seconds. <----
14. Use the graph of (x) to find the solutions to the equation f(x)=0
Two solutions: x=-4, 7 <----
Two solutions: x=4,-7
One solution: x=28
No solutions.
15.
16.Solve the equation using the zero product property. (2x-4)(2x-1)=0
2, -1/2
2, 1/2 <----
-2, 2
-2, 1/2
18. A community group is planning the expansion of a square flower garden in a city park. If each side of the original garden is increased by 3 meters, the new total area of the garden will be 225 square meters. Find the length of each side of the original garden.
15 m
3 m
12 m <----
√12 m
19. What is the value of c so that y=x^2+15x+c is a perfect square trinomial?
30<----
15/2
15/4
225/4
20.Solve the equation by completeing the square. Round to the neareset tenth. x^2+8x=10
1.1, 9.1 <----
1.1, -9.1
-1.1, 9.1
-1.1, -9.1
21.Solve the equation by completeing the square. x^2+9x-14=0
10.35, 1.35<----
10.35, -1.35
-10,35, -1.35
-10.35, 1.35
22. Use the quadratic formula to solve the equation. If necessary, round to the nearest hundredth. x^2-12=-4x
6,2
6,-2
-6,2 <---
-6, -2
2 answers
Your answer for #18 is correct.
1 answer