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denpristay [2]
3 years ago
8

Two towns are 80km apart. Sylvia wants to drive from one town to the other in exactly one hour. For the first 30minutes she driv

es at a rate of 60km/h. At what constant rate must she drive for the next 30minutes if she is to accomplish her goal?
Mathematics
1 answer:
Varvara68 [4.7K]3 years ago
5 0

Answer:

100 km/hr

Step-by-step explanation:

First Leg:

Speed = 60 km/h

Time = 30 min = 0.5 h

1st leg distance = speed x time = 60 km/hr x 0.5hr = 30 km

Second Leg:

Distance remaining = 80 km - 30 km = 50 km

Time = 30 min = 0.5 h

speed = distance / time = 50 / 0.5 = 100 km/hr

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Answer:

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4 0
3 years ago
What is the equation of the line that goes through the points (-5,-1) and (5,5)?
Margaret [11]

Answer:

y = 3/5 x + 2.

Step-by-step explanation:

Use the point-slope equation of a straight line:

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Here:

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Substituting for m and  (5, 5):

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3 0
2 years ago
(x+2)(x-3)(x+5) is identical to x^(3)+ax^(2)-11x+b<br> Find the value of a and the value of b
lutik1710 [3]

Answer:

a = 4 and b = - 30

Step-by-step explanation:

Expand the left side and compare like terms on both sides, that is

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= (x² - x - 6)(x + 5) ← distribute

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= x³ + 4x² - 11x - 30

Compare like terms with x³ +ax² - 11x + b

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3 years ago
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2 years ago
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