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UNO [17]
2 years ago
5

Solve using the quadratic formula.

Mathematics
1 answer:
worty [1.4K]2 years ago
5 0
The quadratic formula is:
x =  \frac{ - b +  -  \sqrt{ {b}^{2}  - 4ac} }{2a}
so...
x =   \frac{ - ( - 1) +  -  \sqrt{( - 1)^{2} - 4(4)( - 7) } }{2(4)}
so simplified from calculator work

x =  \frac{1 +  \sqrt{113} }{8}  \: and \:  \frac{1 -  \sqrt{113} }{8}
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The ratio of red marbles to blue marbles is 3 to 7 she has a total of 80. how many red and blue marbles
atroni [7]
This means that 3/10 are red and that 7/10 are red, so 7/10(80) =  56blue marbles and 3/10(80)= 24red marbles
5 0
3 years ago
In which direction should the motorboat head in order to reach a point on the opposite bank directly east from the starting poin
kotykmax [81]

Answer:

east

Step-by-step explanation:

3 0
2 years ago
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A ladder is placed against a wall. The foot of ladder is 3 feet away from the wall and the top of the latter hits the wall 15 fe
nikklg [1K]

Answer:

i think 2

Step-by-step explanation:

8 0
3 years ago
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Please help me thanks please
Semenov [28]

Answer:

80 cubic units

Step-by-step explanation:

Volume of rectangular pyramid = ⅓*L*W*H

L = 8 units

W = 5 units

H = OP = 6 units

Plug in the values into the equation

Volume = ⅓*8*5*6

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3 0
2 years ago
Find the equation of a line that passes through the points (2,2) and (3,6).
tester [92]

Answer:

y =4x-6

Step-by-step explanation:

first we have to find the gradient,m

m= y2-y1/x2-x1

= 6-2/3-2

= 4/1

=4

equation : y=mx+c , m=4 , (2,2) [you have only take one point either (2,2) or (3,6) is up to you ;) ]

so , sub the point and gradient into y=mx+c:

2=4(2)+c

2=8+c

2-8=c

-6=c

c=-6

In the end , y =4x-6

hope this help you!! ;)))

7 0
3 years ago
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