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3 years ago

If x is 6, then 7x =

Mathematics

1 answer:

Lana71 [14]3 years ago

3 0

I think it's 42 since 7x6=42

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An ice cube is melting, and the lengths of its sides are decreasing at a rate of 0.8 millimeters per minute At what rate is the

julia-pushkina [17]

Answer:

The rate of decrease is: $43.2mm^3/min$

Step-by-step explanation:

Given

$l = 18mm$

$\frac{dl}{dt} = -0.8mm/min$ ---- We used minus because the rate is decreasing

Required

Rate of decrease when: $l = 18mm$

The volume of the cube is:

$V = l^3$

Differentiate

$\frac{dV}{dl} = 3l^2$

Make dV the subject

$dV = 3l^2 \cdot dl$

Divide both sides by dt

$\frac{dV}{dt} = 3l^2 \cdot \frac{dl}{dt}$

Given that: $l = 18mm$ and $\frac{dl}{dt} = -0.8mm/min$

$\frac{dV}{dt} = 3 * (18mm)^2 * (-0.8mm/min)$

$\frac{dV}{dt} = 3 * 18 *-0.8mm^3/min$

$\frac{dV}{dt} = -43.2mm^3/min$

<em>Hence, the rate of decrease is: 43.2mm^3/min</em>

8 0

3 years ago

What height on the wall will a 15 foot ladder reach if its plaxed 3.5 feet from the base of a wall

quester [9]

I would be happy to help with this question!
you would need to use the pythagorean theorem inputting 3.5 for a and 15 for c. after this you will need to solve for b and you should get the answer of 14.6feet

7 0

3 years ago

Read 2 more answers

Below are two parallel lines with a third line intersecting them.

Law Incorporation [45]

Answer:

The line intersecting is a transversal and x is 44 degrees.

Hope it helps!!!

7 0

2 years ago

State what additional information is required in order to know that the triangles are congruent for the reason given. If possibl

Ierofanga [76]

In this We need one more side congruent because one is common i.e FG. It is the line which is Dividing it into two triangles. The property used here is SAS or Side-angle-side Property.

7 0

2 years ago

Read 2 more answers

PLEASE HELP I NEED TO KNOW IF IM CORRECT

Luba_88 [7]

You are not correct, polygons can't have curved edges.

7 0

3 years ago