3 years ago

There are three toy cars, if you are given two more, but four are taken away, how many are left?

Mathematics

1 answer:

Svetach [21]3 years ago

8 0

Answer:

4 are left

Step-by-step explanation:

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Step-by-step explanation:

if a=15

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Oksanka [162]

This statement is false

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Elena-2011 [213]

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2. Is 4x – 3 = 19 true, false, or open? <br> A)true<br> B)false<br> C)open

ElenaW [278]

Answer: B. False

Step-by-step explanation: Because you do

4x - 3 = 19

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3 years ago

A 5-meter ladder is leaning against the side of a house. The foot of the ladder is pulled away from the house at a rate of 0.4 m

Flura [38]

<h2>The top of the ladder is descending at 0.3 m/s.</h2>

Step-by-step explanation:

By Pythagoras theorem we know that

Hypotenuse² = Base² + Perpendicular²

h² = b² + p²

We have for ladder

h = 5 m

b = 3 m

5² = 3² + p²

p = 4 m

$\frac{db}{dt}=0.4m/s\\\\\frac{dh}{dt}=0$

Differentiating h² = b² + p² with respect to time

$2h\times \frac{dh}{dt}=2b\times \frac{db}{dt}+2p\times \frac{dp}{dt}\\\\5\times 0=3\times 0.4+4\times \frac{dp}{dt}\\\\\frac{dp}{dt}=-0.3m/s$

The top of the ladder is descending at 0.3 m/s.

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3 years ago