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3 years ago

Plz help me well mark brainliest if correct

Mathematics

2 answers:

grandymaker [24]3 years ago

8 0

Answer:

61 seconds

Step-by-step explanation:

Triss [41]3 years ago

7 0

Answer:

23 seconds

Step-by-step explanation:

The slowest time is 23 second and the fastest time is 61 seconds

The time before the bar is the tens place and each time after the bar is the ones place

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Which of the ratios does not form a proportion 28.49=4.7

VARVARA [1.3K]

28.49 because they dont have a proportion

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3 years ago

Absolute value of -4 - 8i

Nitella [24]

√80 because the absolute value for complex numbers of the form a+bi are evaluated as √a²+b²

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4 years ago

In paralelleogram ABCD, diagnosis AC and BD intersect at point E, BE=X2-40 and DE= 6x. What is BD?

Alchen [17]

Answer:

Length of BD = $x^2$ +6x - 40

Step-by-step explanation:

In parallelogram ABCD , diagonals AC and BD intersect at E .

In a parallelogram , the two opposite sides are parallel and equal in length.

Also opposite angles of a paralleogram are equal .

Here the length of the parts of a diagonal is given.

BE = $x^{2}$ - 40

DE = 6x

Since the length of whole diagonal is the sum of the lengths of the parts of the diagonal ,

Length of BD = BE + DE

= $x^{2}$ -40 + 6x

Length of BD = $x^2$ +6x - 40

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3 years ago

If an item has a retail price retail price = $995 and a discount of 15%, how much is the discount?

solmaris [256]

The discount of 15% is $149.25 ,you now only have to pay $845.75.

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3 years ago

Read 2 more answers

What are the vertex focus and directrix of a parabola with equation x=y^2+14y-2

zimovet [89]

This is a sideways opening parabola, opening to the right to be more specific, since the leading coefficient is a positive 1. The rule for a focus and a directrix is that they are the same number of units from the vertex (in other words, the vertex is dead center between them), and that the vertex is on the same axis that the focus is. We need to find the vertex then to determine what the focus and the directrix are. We will complete the square on that to find the vertex. Begin by setting it equal to 0, then move the 2 over by addition to get $y^2+14y=2$ . Now we will complete the square on the y terms. Take half the linear term, square it, and add it to both sides. Our linear term is 14. Half of 14 is 7, and 7 squared is 49. So we add 49 to both sides. $y^2+14y+49=2+49$ , which of course simplifies to $y^2+14y+49=51$ . The purpose of this is to find the k coodinate of the vertex which will be revealed when we write the perfect square binomial we created during this process: $(y+7)^2=51$ . Moving the 51 back over by subtraction gives us $(y+7)^2-51=x$ . The vertex then is (-51,-7). The formula to find the focus using this vertex is $(h+ \frac{1}{4a},k)$ . As I stated quite a while ago, the leading coefficient on our parabola was a +1 so our "a" value is 1, and the focus is then found in $(-51+ \frac{1}{4},-7)$ which simplifies to $(-50.75, -7)$ . If the vertex is (-51, -7) and the focus is (-50.75, -7), then the distance between them is 1/4, or .25. That means that the directrix is also .25 units from the vertex, but in the other direction. Our directrix is a vertical line, and it will have the equaion x = -51.25. Summing up, your focus is (-50.75, -7) and your directrix is x = -51.25

7 0

4 years ago