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4 years ago

Please help: Simplify: -1/2x + 3 - 4x + 5 + 3/2x

1 answer:

8 0

Wait, didn't I answer this yesterday?
eh

group like terms
-1/2x-4x+3/2x+3+5
add
-4x-1/2x+3/2x+8
-4x+2/2x+8
-4x+1x+8
-3x+8

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The best one is 1/9 maybe

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What is the perimeter of a semicircle if the diameter is 2

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Step-by-step explanation:

d = 2

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Nataly [62]

Answer:

babysitting = $9

working at coffeehouse = $12

x = hours for babysitting

y = hours at coffeehouse

minimum = ≥

9x + 12y ≥ 240

Step-by-step explanation:

just a short note on which symbol you should use when you see these words in inequality questions:

i) use ≥

-more than or equal to

-not less than

-at least

-minimum

ii) use >

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7 0

3 years ago

A car has mass 1500 kg and is traveling at a speed of 35 miles/hour. what is its kinetic energy in joules? (Be sure to convert m

photoshop1234 [79]

Answer:

Factor by which kinetic energy increase = 4 times

Step-by-step explanation:

Given,

Mass of the car, v1 = 1500 kg

initial speed of car = 35 miles/h

$=\dfrac{35\times 1609.34}{3600}\ m/s$

= 15.64 m/s

Initial kinetic energy of the car is given by,

$k_1\ =\ \dfrac{1}{2}.m.v_1^2$

$=\ \dfrac{1}{2}\times 1500\times (15.64)^2\ joule$

= 183606.46 J

Final velocity of car v2 = 70 miles/hour

$=\dfrac{70\times 1609.34}{3600}$

= 31.29 m/s

So, final kinetic energy of car is given by

$k_2\ =\ \dfrac{1}{2}.m.v_2^2$

$=\ \dfrac{1}{2}\times 1500\times (31.29)^2$

= 734425.84 J

Now, the ratio of final to initial kinetic energy can be given by,

$\dfrac{k_2}{k_1}=\ \dfrac{734425.84}{183606.46}$

$=>\ k_2\ =\ 4k_1$

Hence, the kinetic energy will increase by 4 times.

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3 years ago

-4x + 7.3x + 19.2x - 8.23 <br> and it’s not 22.5x - 8.38 by the way, I tried it .

Gekata [30.6K]

Answer:

You put 8.38 instead of 8.23

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3 years ago

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