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Elis [28]
3 years ago
15

What is 5r^2 = 80 It says solve each equation with the quadratic formula.

Mathematics
1 answer:
katovenus [111]3 years ago
5 0
5r^2 = 80 \ \ /:5\\ \\r^2=\frac{80}{5}\\ \\r^2=16\\ \\r^2-16=0\\ \\ r^2 - 4^2 =0 \\ \\(r-4)(r+4)=0

r-4=0 \ \ \vee \ \ r+4 =0 \\ \\r=4 \ \ \vee \ \ r = -4 \\ \\ \\ a^2-b^2 = (a- b)(a+b)


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Fill in the table using this function rule y=5x-3
Rudiy27

Answer:

-2, -13

0, -3

2, 7

4, 17

Step-by-step explanation:

To fill out the table, substitute the table x-values into the equation and the y-values will fill the table.

y = 5x - 3

y = 5(-2) - 3

y = -10 - 3

y = -13

This means the table value corresponding to -2 should be -13.

y = 5x - 3

y = 5(0) - 3

y = 0 - 3

y = -3

This means the table value corresponding to 0 should be -3.

y = 5x - 3

y = 5(2) - 3

y = 10 - 3

y = 7

This means the table value corresponding to 2 should be 7.

y = 5x - 3

y = 5(4) - 3

y = 20 - 3

y = 17

This means the table value corresponding to 4 should be 17.

6 0
2 years ago
Two planes are flying away from Toronto Pearson International Airport. The Air Canada
erica [24]

Answer:

1832 miles

Step-by-step explanation:

First we need to find the angle between the routes of the planes.

If one is N30°W and the other is S45°W, we can find the angle between the routes with the following equation:

30 + angle + 45 = 180

angle = 105°

Then, we need to find the distance travelled by each plane, using the formula:

distance = speed * time

The time is 1.5 hours, so we have that:

distance1 = 800 * 1.5 = 1200 km

distance2 = 750 * 1.5 = 1125 km

Now, to find the distance between the planes, we can use the law of cosines:

distance^2 = 1200^2 + 1125^2 - 2*1200*1125*cos(105)

distance^2 = 3356214.43

distance = 1832 miles

5 0
3 years ago
Hot dogs are soo in packages of 8 and hot dog buns are sold in packages of 12. What is the smallest number of each that could be
ale4655 [162]
D 24

12 times 2 equals 24
8 times 3 equals 24
4 0
3 years ago
Please help. Thank you.
damaskus [11]
(10x + 4) + (5x-4) ≈ 180

solve for x and you get x≈12 
 
plug 12 in to 5x-4 and you get 56 
7 0
3 years ago
6. Write an algebraic expression for the word phrase 5 times the product of x and y
Lena [83]

Answer:

5+x=y ,x-y=5,y-x=5,5-x=y,y+5=x

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
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