If it took Brianna 4 hours to mow 20 lawns then at that rate how many hours does it take her to mow one lawn?

Answers

Answer 1

Answer: 5 hours to mow one lawn, because 20 divided by 4=5

Answer 2

Answer: it would take at least 15 minutes to mow her own lawn

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!!!!!!!!!!!!!!!!!!!!!!!!!!!50 POINTS!!!!!!!!!!!!!!!!!!!!!!!!+ BRAINLIESTWhat is the absolute value of −3/4?Plot your answer on the number line.

Find an equation for the parabola with focus at (-5,-4) and vertex at (-5,-3)

Answers

Answer:

$(x+5)^(2)=-4(y+3)$

Step-by-step explanation:

Given:

Focus point = (-5, -4)

Vertex point = (-5, -3)

We need to find the equation for the parabola.

Solution:

Since the x-coordinates of the vertex and focus are the same,

so this is a regular vertical parabola, where the x part is squared. Since the vertex is above the focus, this is a right-side down parabola and p is negative.

The vertex of this parabola is at (h, k) and the focus is at (h, k + p). So, directrix is y = k - p.

Substitute y = -4 and k = -3.

$-4 = -3+p$

$p=-4+3$

$p=-1$

So the standard form of the parabola is written as.

$(x-h)^(2)=4p(y-k)$

Substitute vertex (h, k) = (-5, -3) and p = -1 in the above standard form of the parabola.

So the standard form of the parabola is written as.

$(x-(-5))^(2)=4(-1)(y-(-3))$

$(x+5)^(2)=-4(y+3)$

Therefore, equation for the parabola with focus at (-5,-4) and vertex at (-5,-3)

$(x+5)^(2)=-4(y+3)$

Find the radius of a cone with a volume of 175 cm and a height of 21 cm

Answers

Answer:

The answer is r≈2.82

The largest mammal ever found on Earth was a female blue whale with a mass of more than158,000,000 grams. Express this mass in kilograms.

Answers

Answer:

158000

Step-by-step explanation:

Formula:

divide the mass value by 1000

Plz help me get the right answer

Answers

Hi! All you have to do is add 3 to both sides of the equation to find the answer.

w - 3 > 9

w - 3 + 3 > 9 + 3

w > 12

Hope this helps you!

Answer:

w > 12

Step-by-step explanation:

$w-3>9\qquad\text{add 3 to both sides}\n\nw-3+3>9+3\n\nw>12$

Kieras dance class starts at 4:30 pm and ends at 6:15 pm. How long is get dance class?

Answers

If Kiera's dance class starts at 4:30 p.m. and ends at 6:15 p.m. then how long is it? Lets find out. The way I solved it would be to count by hours. 4:30 to 5:30 is one hour. 5:30 to 6:30 is 2 hours. But 6:30 is too much time. So now you take away the required amount to make it 6:15. You have to take away 15 minutes. So 2 hours minus 15 equals 1 hour and 45 minutes.
Kiera's dance class was 1 hour and 45 minutes long.

Answer: 1 $(1)/(2)$ hour

max cycles at a speed of 15 mph. He cycles 12 miles from home to school. If he increases the sped by 5 mph, how much faster will he reach his school?

(if you answer the question please show how you got it, please.)

Answers

First of all, you're not really asking "How much faster ?".
That would be "5 mph faster".
You're really asking "How much sooner ?"

At 15 mph, the trip takes him 12/15 = 4/5 hour.

At 20 mph, the trip takes him 12/20 = 3/5 hour.

The time saving is (4/5 - 3/5) = 1/5 hour .

= 12 minutes

Notice that by changing to 5/4 of his original speed,
he changed the trip to 4/5 of the original time.
It always works out like that ... reciprocally.

the cyclist would be going 20 mph after increasing his speed by 5 mph. but we would need to know how fast it took him to get to school when he was going to school to figure out how long it would take him to get to school. the distance 12 miles would not get shorter with max going faster, it would stay the same. so you would need to know how long it was taking him to get to school before i could do the math to figure out how fast he would get to school with his increased speed.

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