Mathematics High School

A rock is thrown down from a cliff that is 180 m high. The function
h(t) = -5t^2 – 10t + 180 gives the approximate height of the rock
above the water, where h(t) is the height in metres and t is the time
in seconds. When will the rock reach a ledge that is 105 m above
the water?

Answers

Answer 1

Answer:

t = 3

Step-by-step explanation:

105 = -5t^2 -10t + 180

-75 = -5t^2 -10t

15 = t^2 +2t

t^2 +2t -15 = 0

(t+5)(t-3)

t = -5, 3

There's no such thing as negative time so you use the positive answer

Related Questions

Find two integers whose sum is -3 and product is -70

Answers

Answer:

(-10) and 7

Step-by-step explanation:

-3 = (-10) +(7)= -3 (because + and - give you a - )

-70 = (-10) x (7)= -70

hope it answers your question correctly.

give me the most DETAILED explanation.

6 + 6 - 6 x 6 ÷ 6 = ?

Answers

6+6-6*1

6+6-6

12-6

6 is the answer

The probability of picked a blue morble out of a bag of 50 marbles is 3/25. How Many marbles in the bag are not blue?​

Answers

Answer:

44

Step-by-step explanation:

22/25 = not blue

22 × 2 = 44

Find the missing number (i.e. the coefficient in front of x) so that the equation has no solutions: □x + 4 = 4x + 15

Answers

Answer:

X=8

Step-by-step explanation:

x = -1+y
2x - y = 0
All of this is one question it’s simultaneous equations. Can someone please help

Answers

Answer:

y = 2

Step-by-step explanation:

x= -1+y

2x-y=0

2(-1+y)-y=0

-2+2y-y=0

-2+y=0

-2+2+y=0+2

y=2

hope it's helpful ❤❤❤❤

THANK YOU.

#

Answer:

[tex]2( - 1 + y) - y = 0 \\ - 2 + 2y -y = 0 \\ y = 0 + 2 \\ y = 2 \\ x = - 2[/tex]

pls help

Solve the following system of equations for y using elimination:

6x – 12y = 24
-X – 6y = 4

A. -6
B. 0
C. -1
D. 4

Answers

Answer:

C

Step-by-step explanation:

5x^2-10x=0 written in factored form​

Answers

Answer: 2,x=0
You can use symbolab

Pls help me with this math..... its kind of easy...

Answers



a=9.2
b=1 5/8
c=4
d=24
e=2.3
f=8.5
g= 2.6
A) 9.2
B) 1 5/8
C) 4
D) 24
E) 2.3
F) 8/5
G) 2.6

FIND THE ORIGINAL PRICE SAW.
4. Nick's parents paid $435 for an x-box gaming system. This was after the 20%
Game Stop Loyal Customer member discount How much is the game console to
customers who are not Loyal Customer members?

Answers

Answer: $87

Step-by-step explanation:

PLEASE HELP YOULL GET 20 POINTS
Suppose a movie rental company charges $9.99 per month plus $1.25 for every movie rented.
A. Write a function rule that represents the relationship between the number of movies rented in a month and
the rental charge for that month.
b.
Write an equation that you could solve to find how many movies you rented if the total rental charge for one
month was $23.74.
C.
Solve this equation using a table.

Answers

Answer:

9.99+ 1.25x. X represents the every movies rented. I think my answer matches b, I am not sure.

Step-by-step explanation:

what they said^^^:))

Divya wants to make fruit smoothies for dessert. She purchases a container of rice milk for $3.49, two pounds of strawberries at $4.99 per pound, and six bananas at $0.75 each. How much did Divya spend on dessert? Show your work.
PLEASE HURRY

Answers

First you put them together and add all the prices up to get total and you will get the answer $9.23

PLEASE HURRY TY:)))))):):);););)::):):):):):):):

Answers

ASA. Benebdbdbfbdvfvfvfv
End d f f

please help me will give you brainliest!!

Answers

Answer:

Yes

No

No

Yes

Step-by-step explanation:

Is this ALEKS?

Answer:

-8 , -4 is a yes

1,4 is a yes

0, -7 is No

-3. -2 is No

Step-by-step explanation:

Pls branliest—0

Please help me geometry

Answers

Answer:

ASA

Step-by-step explanation:

ASA Congruence Theorem

I need help on this problem. Does anyone know how to complete it? Please and thank you :)

Answers

i think it's 5 because i remember learning that it's gonna be half of what the bottom is

PLEASE HELP ASAP!!! 50 points

Answers

in the order A, B, C
Yea in the order abc

If the RADIUS of a circle is 9 meters, then the DIAMETER is? *
25 points
4.5 meters
12 meters
18 meters
27 meters

Answers

The diameter is 18 meters, d = 18m

10) pls help i’ll give 20 points :)

Answers

Answer: The blank space in the equation is 4.

Step-by-step explanation: -6 x +2 is -12. -48/-12 is 4. Therefore, the blank space in the equation is 4.

Need help ASAP

which point could represent 5 over 3?​

Answers

Answer:

I think D, I am not sure though

Step-by-step explanation:

Answer:

5/3 is 5÷3 = 1.666666. point C is closest to 1.67.

OMg plzzz help due 5 minutes answer whatever u can and real answers plz

Answers

I am srry I don’t understand any of that

solve for z 7z + 4 - 9z = 8 (also please don't have the answer be a negative)

Answers

Answer:

z = -2

Step-by-step explanation:

lol okay If it said that

Find the slope between the following two points: (-4, 6) (5, 2)​

Answers

Answer:

m=-4/9

Step-by-step explanation:

Hope this helps ❤

Which of the following are true?
Select all that apply.
A
-(-9) 9
B
-(-5) = -5
C
-(10) - 10
The opposite of 8 will be 8 units to the left of 0 on a number line,
E
The opposite of every number will be to the left of 0 on a number line

Answers

Answer:

A, C, D, and E

Step-by-step explanation:

B is not correct because you would have 5 = -5, which is not true

Y = -3 + 1/2x 3x + 2y = 2


Help ASAP this is due today

Answers

The solution to this would be x=2, y=-2

1. What is 7/50 as a Percentage?

2. What is 3/25 as a Percentage?

3. What is 3/16 as a Percentage?

Please help!

Answers

1. What I do is get the 7/50 to have the denominator as 100 so I just double the 50 and the seven and get 14/100 so it’s 14%.

2. Same thing except 25 goes into 100 four times so I multiple the 3 and 25 by four and get 12/100 so it’s 12%.

3. Do 3 divided by 16, and you get .1875. So that’s 18.75% or you can do 100 divided by 16 and get 6.25. Then you multiply the 6.25 times the 3 and get 18.75%

A box has a length of 8 centimeters, a width of 7 centimeters, and a height of 5 centimeters. What is the total volume of the box?

A 616161 cubic centimeters

B 969696 cubic centimeters

C 250250250 cubic centimeters

D 280280280 cubic centimeters

Answers

The answer might be A or B I don’t know.

Catherine bought apples and pears for a school picnic. The total number of pieces of fruit that she bought was less than 100. She bought more apples than pears.​

Answers

Answer:

it says LESS THAN not less tha n or equal to  so it cant be a or b or d, so it is c!

Step-by-step explanation:

Catherine bought apples and pears for the school picnic. If the total fruit is less than 100, then the correct equation for this will be y<100-x and y<x. Hence, option C is correct.

What is an equation?

Equations are mathematical expressions that have two algebra on either side of an equal (=) sign. The expressions on the left and right are shown to be equal to one another, demonstrating this relationship. L.H.S. = R.H.S. (left-hand side = right side) is a fundamental simple equation.

As per the given data in the equation,

Catherine bought apple and pears.

The overall quantity is less than 100

Let the number of apples is x and,

The number of pears is y.

She bought more apples than pears,

y<x.

And y < 100-x.

To know more about an equation:

https://brainly.com/question/10413253

#SPJ2

Rewrite the expression as a power of a product. 9x^{6} y^{8} pls answer quick need rn.

Answers

Answer:

In this case, 9,  x⁶  and y⁸ are all perfect squares, so we can take that out, saying:

9x⁶y⁸ = (3x³y⁴)²

Suppose both factors in a multiplication problem are multiples of 10. Why might the number of zeroes in the product be different than the total number of zeroes in the factors?

Answers

Answer:

Multiplying factors whose products are multiples of 10 add to the number of zeros when factors are multiplied as multiples of 10s.

Step-by-step explanation:

Let the first five multiples of ten be

10*1= 10

10*2= 20

10*3=30

10*4=40

10*5= 50

Suppose we chose 20 and 50.

Now multiplying 20 with 50 we get

20*50= 1000

IF we count the total number of zeros in the factors ( 20 and 50) they are 2.

But the number of zeros in the product (1000) are 3.

This is because when we multiply 2 with 5 we get 10 which adds to the existing number of zeros ( i.e 2) and we get a total of 3 zeros.

And multiplying 10 with 50 we get

10*50= 500

IF we count the total number of zeros in the factors ( 10 and 50) they are 2.

But the number of zeros in the product (500) are also 2.

This is because when we multiply 1 with 5 we get 5 which does not add to the existing number of zeros ( i.e 2) and the total number of zeros remain the same.

Similarly multiplying 20 with 30 we get

20*30= 600

IF we count the total number of zeros in the factors ( 20 and 30) they are 2.

But the number of zeros in the product (600) are also 2.

This is because when we multiply 2 with 3 we get 6 which does not have a zero and the total  number of zeros remain the same as in the factors.

So we see that multiplying factors whose products are multiples of 10 add to the number of zeros when factors are multiplied as multiples of 10s.

Find the value of x in the equation below 5= x/6

Answers

Answer:

x=30

Step-by-step explanation:

Answer:

x=30

Step-by-step explanation:

To find the value of x in an equation, our goal is always to isolate it so that it's on one side of the equal sign while everything else is on the other. We can do this by performing inverse operations to cancel values out (for example, the inverse operation of addition is subtraction and the inverse operation of division is multiplication).

5=x/6

Because x is being divided by 6, we multiply both sides by 6 to cancel it out on the side with x.

5×6=(x/6)×6

5×6=x

30=x

I hope this helps!

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