i don't understand this..

Answer:

t = 4 seconds

Step-by-step explanation:

The height of the projectile after it is launched is given by the function :

[tex]h(t)=-16t^2+32t+128[/tex]

t is time in seconds

We need to find after how many seconds will the projectile land back on the ground. When it land, h(t)=0

So,

[tex]-16t^2+32t+128=0[/tex]

The above is a quadratic equation. It can be solved by the formula as follows :

[tex]t=\dfrac{-b\pm \sqrt{b^2-4ac} }{2a}[/tex]

Here, a = -16, b = 32 and c = 128

[tex]t=\dfrac{-32\pm \sqrt{(32)^2-4\times (-16)(128)} }{2\times (-16)}\\\\t=\dfrac{-32+ \sqrt{(32)^2-4\times (-16)(128)} }{2\times (-16)}, \dfrac{-32\- \sqrt{(32)^2-4\times (-16)(128)} }{2\times (-16)}\\\\t=-2\ s\ \text{and}\ 4\ s[/tex]

Neglecting negative value, the projectile will land after 4 seconds.

Answer:

12

Step-by-step explanation:

Since M is a midpoint of LN, we can see 3x equal to x+8. Remove 1 x to get 2x=8. Solve for x to get x=4. Note that this is not the end to your problem. They asked for the length of MN, not the value of x. Plugging x into MN give you 4+8, which is 12.

(If you need to show work, here it is)

3x=x+8

2x=8

x=4

MN=x+8

MN=4+8

MN=12

Step-by-step explanation:

[tex]x {}^{2} + 3x - 18 \\ = x {}^{2} + (6 - 3)x - 18 \\ = x {}^{2} + 6x - 3x - 18 \\ = x(x + 6) - 3(x + 6) \\ = (x + 6)(x - 3)[/tex]

Thank you ☺️☺️

Answer:88*8y=6x

Step-by-step explanation:

Answer:

4.50 i think

Step-by-step explanation:

a product that normally costs $25 with a 18 percent discount will cost you $20.50, and you saved $4.50. You can also calculate how much you save by simply moving the period in 18.00 percent two spaces to the left, and then multiply the result by $25 as follows: $25 x . 18 = $4.50 savings.

Answer:

4.5

Step-by-step explanation:

you multiply 18 and 25 to get an answer of 450 then divided it by 100 to get 4.50

Answer:

9 to the 7th power

Step-by-step explanation:

Answer:

The second one.

Step-by-step explanation:

Both intercept twice at 0 and -4.

Answer:

5

Step-by-step explanation:

2*(5)=10+6=16

Answer:

I'm guessing you want the value of "a number" which is 5

Step-by-step explanation:

subtract 6 from 16 and you get 10

2 x 5 = 10

The number is 5

Answer:

1.5 pounds of potato salad for 4.50 would be cheaper

Step-by-step explanation:

because if you divide 3.50 by two you get 1.75 and added back to 3.50 you can purchase 1.5 pounds for 5.25 which is more expensive than 4.50

Answer:

Step-by-step explanation:

Answer:

Step-by-step explanation:

proucer surplus

Answer:

Maggie is 7 years old

Step-by-step explanation:

m+2m-4=17

3m-4=17

3m=21

m=7

Answer:

Maggie is seven years old

Step-by-step explanation:

Maggie's Brothers Age = B

Maggie's Age = M

2M - 4 = B

B + M = 17

Plug in 2M - 4 for B

( 2M - 4 ) + M = 17

Combine Like Terms

3M - 4 = 17

Add 4 to either side

3M = 21

Divide either side by 3

M = 7

Check your answer

2M - 4 = B -> 2 x 7 - 4 = B -> 14 -4 = B -> B = 10

B + M = 17 => 7 + 10 = 17 => 17 = 17

Answer:

36 i think

Step-by-step explanation:

16 divided by 4 is 4

36 divided by 4 is 9

4*9=36

Answer:

324 square inches

Step-by-step explanation:

1/4 of 16 = 4

16-4 = 12

1/4 of 36 = 9

36-9 = 27

A= l*w

A= 27 x 12

A= 324 square inches

The contrapositive of this statement would be: "If x does not equal -4, then 5x + 7 will not equal to -13."

The contrapositive is defined as the inverse and converse of a conditional statement.

X is equal to 4 we know this is because the sign in between the number means greater than or equal to so 3 x 4 equals 12 which makes the equation on right true and on the left x.

So, the contrapositive of this statement would be:

"If x does not equal -4, then 5x + 7 will not equal to -13."

Learn more about contrapositive ;

https://brainly.com/question/5306301

#SPJ2

Answer:

B

Step-by-step explanation:

90+45+45=180

All triangles equal 180.

Its B because if one angle is 90° then the other angles will equal each other. It cant be 60° and 30° because they dont equal, so your final answer is B.

Hope this Helps!!! :)

The answer is y = 12x - 24

Use the form y = mx + b

If the points are (2, 0) and (3, 12) the slope is 12 which gives us m.

Since every time you go backwards once it goes down 12, (1, -12) is a point and then (0, -24) is a point that shows us the y-intercept which gives us b.

Answer:

n = 2

Step-by-step explanation:

Simplifying

(n + 8) + (n + -12) = 0

Reorder the terms:

(8 + n) + (n + -12) = 0

Remove parenthesis around (8 + n)

8 + n + (n + -12) = 0

Reorder the terms:

8 + n + (-12 + n) = 0

Remove parenthesis around (-12 + n)

8 + n + -12 + n = 0

Reorder the terms:

8 + -12 + n + n = 0

Combine like terms: 8 + -12 = -4

-4 + n + n = 0

Combine like terms: n + n = 2n

-4 + 2n = 0

Solving

-4 + 2n = 0

Solving for variable 'n'.

Move all terms containing n to the left, all other terms to the right.

Add '4' to each side of the equation.

-4 + 4 + 2n = 0 + 4

Combine like terms: -4 + 4 = 0

0 + 2n = 0 + 4

2n = 0 + 4

Combine like terms: 0 + 4 = 4

2n = 4

Divide each side by '2'.

n = 2

Simplifying

n = 2

Answer:

You subtracted 25 from both sides.

Step-by-step explanation:

To move one part of the equation to the other side, you need to do the opposite. 25 is already negative(or being subtracted) so you need to add it to both sides to cancel it out on the left.

10x=-75+25

10x=-50

then divide both sides by 10

x=-5

Answer:

×<-1

Step-by-step explanation:

if I'm not wrong you are sloving for x right?

Answer:

(- ∞, - 1 )

Step-by-step explanation:

Given

4(x + 2) < - [tex]\frac{1}{2}[/tex] (4x - 4) ← distribute parenthesis on both sides )

4x + 8 < - 2x + 2 ( add 2x to both sides )

6x + 8 < 2 ( subtract 8 from 2 )

6x < - 6 ( divide both sides by 6 )

x < - 1

x ∈ (- ∞, - 1 ) ← in interval notation

Answer:

he is incorrect

Step-by-step explanation:

He is incorrect because 10 times 3 is 30, plus-minus 2 which is 30. So instead of 34, it is 30. or you can say Anthony is wrong. Following the order of operations, you would do the 10*3 first. Then, you would take the 30, and finish the equation from left to right. So you would add 2 to make it 32 and then subtract 2 to make it 30 again. So your final answer is 30, not 34. So Anthony is wrong.

Answer:

Jack needs to run at a speed of 1/12 mph

Step-by-step explanation:

Mathematically;

speed = distance/ time

Distance = speed * time

10 minutes = 10/60 h = 1/6 hours

The distance to the school will be

Distance = 3 * 1/6 = 1/2 = 0.5 miles

Now, he needs to be at school 4 minutes earlier, time will now be 10 - 4 = 6 minutes

To get the speed here;

Recall that the distance from above does not change

So speed = 0.5/6 mph 0r 1/12 mph

Answer:

Mo's answer is wrong.

635 - 813

= -178

Step-by-step explanation:

a. Is Mo's answer right?

No, Mo's answer is incorrect

Mo did this by working from right to left, Just like Subtraction

• 3 - 5 =

We that 1 from the number in tens , add that to 3, making it 13

13 - 5 = 8

• 1 - 3 = 7

The one above becomes 0, because 1 was taken from it. We add 1 to 0, making it 10

10 - 3 = 7

• 8 - 6 = 1

The 8 above reduces to 7 because 1 has been taken from 8.

Hence: 7 - 6 = 1

635 - 813

= -178

The answer is minus 178 because, we are subtracting the bigger number form the smaller number.

b. Solve

6(100) + 3(10) + 5(1)

- [8(100) + 1(10) + 3(1)]

by working with expanded forms. Discuss how Mo's work compares with your work in expanded forms.

= -1(100) + 7(10) + 8(1)

Answer:

I think the answer is A if my math is wriye

Step-by-step explanation:

Answer:

-11 and -5

Step-by-step explanation:

-11 x -5 = 55, and add to -16

Answer:

x=5 y=3

Step-by-step explanation:

6x-27=4x-17

2x=10

x=5

y=6(5)-27

y=30-27

y=3

y=4(5)-17

y=20-17

y=3

Answer:

11.50

Step-by-step explanation:

The new wage is equal to the old wage plus her raise, so:

x + 0.75 = 12.25

or

x= 12.25-0.75

Meaning x is her original wage, being $11.50

(This is my first answer so let me know if I did anything wrong)

Answer:

B

statement a is division property of equality

statement b is symmetry property of congruence

statement c is multiplication property of equality

Answer:

it would be D 5 hope this helps :)

Step-by-step explanation:

Answer:

I think its D

Step-by-step explanation:

because 564÷71 is 7.9 and if u round that you will get 8