1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
vlabodo [156]
3 years ago
11

PLZ HELP ASAP!!

Mathematics
1 answer:
zysi [14]3 years ago
8 0

Answer:

b

Step-by-step explanation:

You might be interested in
38F hotter or 2C (Tempture)
viva [34]
38* F is hotter. 2*C is only 35.6*
4 0
3 years ago
Read 2 more answers
QUESTION 6 OF 17 A Lyft driver has received 160 reviews with an average rating of 4.4 out of 5 stars. If the driver wanted to ra
dexar [7]
He needs 160 5-star reviews in a role. We can write a function to solve this problem. His current total stars is 4.4*160=704. Suppose he needs x more 5-star reviews, then his total stars will be 704+5x. 160+x is the new number of reviews, and the new average will be 4.7, so 4.7*(160+x)=704+5x. The solution is 160. Besides, if you want to get the answer really fast, you can see that 4.7 is right in the middle of 4.4 and 5, so you can immediately guess that the number of new 5-star reviews should be equal to the number of current reviews.
4 0
3 years ago
A dog jumps straight up. Y=-16t^2+20t models the motion of the dog, where "t" is the time in seconds and "y" is the height of th
alina1380 [7]

Answer:

Step-by-step explanation:

The motion of the dolphin is quadratic

i.e y=-16t²+20t

To get the maximum height the dolphin will reach

We need to find the point of inflexion. i.e dy/dt=0

dy/dt=-32t+20

Then set dy/dt=0

0=-32t+20

Then, -32t=-20

t=0.625

Let find d²y/dt²

d²y/dt²=-32. Since this is negative then the point t=0.625 is the maximum point the dolphin can reach

Then substitute t=0.625 into y

y=-16t²+20t

y=-16(0.625)²+20(0.625)

y=6.25ft

Then the maximum height the dolphin can reach is 6.25ft

Using discriminant

Formular method

y=-16t²+20t

So the dog height y<7

y=-16t²+20t <7

-16t²+20t-7<0

a=-16, b= 20. c=-7

t=(-b±√b²-4ac)/2a

Using the a, b and c direct for the discriminant

D=b²-4ac

D=20²-4×-16×-7

D=-48

Which is a complex number

Then the dolphin can reach the height

Then we need to model the D to be greater than 0

Therefore,

D>0

b²-4ac>0

We cannot do anything to a and b it is already given

a=-16, b=20

(20)²-4(-16c)>0

400+64c>0

64c>-400

Then

c>-6.25

Divide both side by - and the inequality sign will change

Therefore -c<6.25

So the dog height y<6.25

y=-16t²+20t <6.25

Therefore the maximum height is 6.25.

If it is greater than that then, we are going to have a complex root movement which is not possible for the dolphin .

5 0
3 years ago
Please solve this question
n200080 [17]

Answer:

the answer is b

Step-by-step explanation:

3 0
2 years ago
Read 2 more answers
How would I solve number six?
Basile [38]

Answer:

Angle ABC is equal to 130.4°

Step-by-step explanation:

When an angle is bisected, it is divided into two equal parts, so if BD bisects ∠ABC, then the two angles that add up to it, ∠ABD and  ∠DBC, must be equivalent.

We know that ∠ABD equals 65.2, so that must mean that ∠DBC also equals 65.2.

Here is our equation:

∠ABC=∠ABD+∠DBC

After substituting, we will get

∠ABC=65.2+65.2=130.4

130.4° is the measure of ∠ABC.

6 0
3 years ago
Read 2 more answers
Other questions:
  • How to solve v+8/9=10
    8·2 answers
  • Lucy buys 7kg of nuts to sell.
    7·1 answer
  • Which equation represents the line shown in the graph below? y = 5x + 2 y = 2x — 5 y = 2x + 5 y = 5x — 4
    6·1 answer
  • Igor Stravinsky Tires sells approximately 3,760,000 car tires and 1,200,000 truck tires each year. About 47,000,000 care tires a
    10·1 answer
  • Ming drew the model below to represent the equation 24 + 12 = blank x (8 + 4).
    7·2 answers
  • Write an equation of the line that passes through the points (−3,−4) and (0,2).
    9·2 answers
  • Find the area of the shape below<br> I WILL MARK BRAINLEST!!
    6·1 answer
  • Please help me!!!
    7·2 answers
  • What is 9 to the 3rd power x 9 to the second power?​
    12·1 answer
  • Determine the correct path energy follows when using coal or oil to produce electricity.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!