All categories

3 years ago

The value of y varies directly with x. when y = 7.5, x = 5. what is the value of y when x = 80?.

Mathematics

1 answer:

Ksenya-84 [330]3 years ago

4 0

Answer:

Step-by-step explanation:

120 = y. the ratio is 3:2

80/2 is 40

40 times 3 is 120

120:80 = 3:2

You might be interested in

Given that the quadratic equation has equal roots (k^2-1)x^2-2kx-3k-1=0

Alik [6]

Answer:

(See explanation for further details)

Step-by-step explanation:

The real expression is:

$(k^{2}-1)\cdot x{{2} - 2\cdot k \cdot x - 3\cdot k + 1 = 0$

The general equation for the second-order polynomial is:

$x = \frac{2\cdot k \pm \sqrt{4\cdot k^{2}-4\cdot (k^{2}-1)\cdot (-3\cdot k + 1)}}{k^{2}-1}$

This condition must be observed for the case of a quadratic equation with equal roots:

$4\cdot k^{2} - 4\cdot (k^{2}-1)\cdot (-3\cdot k + 1) = 0$

$k^{2} + (k^{2}-1)\cdot (3\cdot k + 1) = 0$

$k^{2} + 3\cdot k^{3} - 3\cdot k - k^{2}-1 = 0$

$3\cdot k^{3} - 3\cdot k - 1 = 0$

7 0

3 years ago

Gail practices swimming for 1 and 1 fourth hours swimming every day how much time does she practice in a week

Lorico [155]

If Gail practises swimming for 1 and 1/4 hours a day, then in a week she'll do:

1 1/4 * 7 = 5/4 * 7 = 35/4 = 8 3/4 [hours]

In other words she'll practice 8 hours and 45 minutes a week (assuming that she's still practicing on weekends).

8 0

3 years ago

Oliver has one juice box and Lucy has one fewer juice box than Oliver how many juice boxes does Lucy have

Crazy boy [7]

The answer is zero. Oliver only has one. So one few would be zero

5 0

3 years ago

Read 2 more answers

3 and 1/2 x 6 and 1/2

Lera25 [3.4K]

Answer:

91/4 or 22 3/4

Step-by-step explanation: i just know

5 0

3 years ago

If the graph of a line goes from the upper left corner of the graph to the lower right corner, what can you say about its slope?

Viktor [21]

You can say that the slope is negative. A line on a graph that goes from the upper left corner to the bottom right is a negative slope.

4 0

3 years ago