Solve. if there is more than one solution, separate them with comas. (y-4)(y+7)=0

Mathematics

1 answer:

kogti [31]2 years ago

3 0

Answer:

y= 4

Step-by-step explanation:

(y-4) (y+7)=0

(4-4) (4+7)=0

(0) (11)=0

11*0=0

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Pls help it due ASAP <br> And show workings!

Crazy boy [7]

Answer:

D. about 40 miles

Step-by-step explanation:

In order to answer the question, you first need to find how many units on the graph Seaside is from Oceanfront - or how long the line between the two points is.

To do this, use the distance formula, $d = \sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$ .

$x_1$ and $y_1$ represent the x and y values of one point, and $x_2$ and $y_2$ represent the x and y values of another point. Use the points of Seaside (by looking on the graph, you can see it's (-2,4)) and Oceanfront (also by looking, you can see it's (3, -2)) for the formula:

$d = \sqrt{((-2)-(3))^2+((4)-(-2))^2\\$

$d = \sqrt{(-2-3)^2+(4+2)^2}$

$d = \sqrt{((-5)^2+(6)^2\\$

$d = \sqrt{25 + 36} \\d = \sqrt{61}$

$\sqrt{61}$ units is about 7.8 units (you can also tell because it's in between $\sqrt{49}$ and $\sqrt{64}$ , which equal 7 and 8). Multiply that by 5 (since each unit on the graph represents 5 miles) and the answer is about 40. So, the answer is D.