4 years ago

A car travels 2 1/3 miles in 3 1/2 minuets at a constant speed

Mathematics

1 answer:

elena-s [515]4 years ago

4 0

2 1/3 miles / 3 1/2 minutes

7/3 * 2/7 = 14/21 = 2/3 mile per minute

A) d = 2/3m

2/3 mile per minute *60 minutes = 40 miles per hour

d=40h

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A+B= -7 and AXB= -15

ZanzabumX [31]

A+b=-7
ab=-15

a=-7-b
b(-7-b)=-15

a=-7-b
-b^2-7b+15=0

a=-7-b
b^2+7b-15=0

a=-7-b
b=(-7±sqrt(109))/2
1)
a=-7-b
b=(-7+sqrt(109))/2

b=(-7+sqrt(109))/2
a=-7+3.5-sqrt(109)/2

b=(-7+sqrt(109))/2
a=-3.5-sqrt(109)/2

2)
a=-7-b
b=(-7-sqrt(109))/2

b=(-7-sqrt(109))/2
a=-7+3.5+sqrt(109)/2

b=(-7-sqrt(109))/2
a=-3.5+sqrt(109)/2

7 0

4 years ago

When 4 is subtracted from the square of a number, the result is 3 times the number. Find the positive solution

vitfil [10]

Answer is 4 = x. Write out The equation. Then converted to a polynomial. Then use the formula in the top upper right and then do the simple arithmetic to find a positive solution for X. it also makes logical sense as well, 3×4 is 12. I hope this helps and makes sense my Hand writing is not the Best