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3 years ago

Which is the value of this expression when a=-2and b=-3

Mathematics

1 answer:

monitta3 years ago

6 0

Let's solve your system by substitution.

a=−2;b=−3

Step: Solve a=−2for a:

a=−2

Step: Substitute−2for a in b=−3:

b=−3

Answer:

a=−2 and b=−3

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An air traffic controller spots two airplanes at the same altitude converging to a point as they fly at right angles to each oth

dedylja [7]

Answer:

(a) D(t) = 250t -500 miles

(b) Controller has 2 hours, but including time for pilots to divert course or altitude.

Step-by-step explanation:

Given:

two planes at same altitude heading in a collision course.

Plane A at 400 miles from collision point at 200 mph

Plane B at 300 miles from collision point at 150 mph.

Theoretical collision happens in

t = 400/200 = 300/150 = 2 hours

Distance ya of plane A from collision point as a function of time in hours

ya(t) = 400 -200t

Distance yb of plane B from collision point as a function of time in hours

yb(t) = 300-150t

(a) Distance between two planes,

Since the two planes are on courses perpendicular to each other, will need using pythagorean theorem

D(t) = sqrt(ya(t)^2+yb(t)^2)

= sqrt((400-200t)^2+(300-150t)^2)

= 250(t-2)

D(t) = 250t -500 miles

b. time available

Time until D(t) = 0

solve D(t) = 0

D(t) = 0

250(t-2) = 0

t = 2 (two hours)

3 0

3 years ago

Tatenda takes t seconds to mow a square meter of lawn and Ciara takes c seconds to mow a square meter of lawn. Tatenda mows 700

bagirrra123 [75]

It is given to us that Tatenda takes t seconds to mow a square meter of lawn and Ciara takes c seconds to mow a square meter of lawn.

It is also given to us that Tatenda mows 700 square meters of lawn per week and Ciara mows 750 square meters of lawn per week.

Thus, if Tatenda mows 700 $m^{2}$ in a week, then that means he took $700\times t$ seconds to complete the mowing.

Likewise, if Ciara mows 750 $m^{2}$ in a week, then that means she took $700\times c$ seconds to complete the mowing.

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2 years ago

Read 2 more answers

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sergey [27]

Remember that dividing a negative number by a negative number will result in a positive quotient:

$-10 \div -20 = 0.5$

The answer is 0.5.

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3 years ago

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Zanzabum

That would be 24%

I hope this helped ya :)

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4 pounds of tomatoes cost $8. How many pounds of tomatoes can you get with<br> $14?

faust18 [17]

Answer:

7 pounds

Step-by-step explanation:

8 divided by 4 is 2 so $2 per pound

14 divided by 2 is 7 so therefore it would be 7 pounds

I had the wrong answer before sry haha

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3 years ago