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slega [8]
2 years ago
9

S

Mathematics
1 answer:
Anarel [89]2 years ago
4 0

Answer:

-7,3

Step-by-step explanation:

look at the pictire

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A train leaves Little Rock, Arkansas, and travels north at 80 kilometers per hour. Another train leaves at the same time and tra
makvit [3.9K]
Distance = rate * time

580 = (80+65) * t
T = 4 hours
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3 years ago
In the expression<br> 7a + b - 12<br> what is the coefficient of a?
marusya05 [52]

Answer:

6

Step-by-step explanation:

4 0
3 years ago
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A length of string that is 240 cm long is cut into three pieces the second piece is 25% longer than the first piece the third pi
Tresset [83]
Hey there,
Let's say that the first piece is x cm
1st = x
2nd = x + 25%
3rd = x - 25%
100% = 240 cm
1% = 240 / 100
      = 2.4cm
x + x + 25 + x - 25 = 100
3x + 25 - 25 = 100
3x = 100 - 25 + 25
3x = 100
3x = 240 cm
x = 240 / 3
   = 80 cm
1st piece = 80 cm
2nd piece = 80 + (25% x 80)
                = 80 + 20
                = 100cm
3rd piece = 80 cm - (25% x 80)
                = 80 cm - 20
                = 60cm

Hope this helps :))

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6 0
3 years ago
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For what value of k will the relation y = kx² + 8x + 8 have only one zero? (3 marks)
Lana71 [14]

Answer:

2

Step-by-step explanation:

2x^2 + 8x + 8

factor the 2 out : 2(x^2 + 4x + 4)

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4 0
3 years ago
The arch of a bridge forms the upper half of an ellipse. The arch is 6 meters above the 20-meter-wide river. Write an equation f
aksik [14]

Answer:

\frac{x^2}{36} + \frac{y^2}{100} = 1

Step-by-step explanation:

Required

The equation of the ellipse

This is calculated as:

\frac{x^2}{a^2} + \frac{y^2}{b^2} = 1

Where:

b =6 ---- height

a = 0.5 * 20 =10 --- width

So:

\frac{x^2}{a^2} + \frac{y^2}{b^2} = 1

\frac{x^2}{6^2} + \frac{y^2}{10^2} = 1

\frac{x^2}{36} + \frac{y^2}{100} = 1

3 0
3 years ago
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