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3 years ago

What is the value of this expression when x = -1 and y = -2?

Mathematics

2 answers:

Crank3 years ago

4 0

Answer:

-16

Step-by-step explanation:

4x³y²

4 × (-1)³ × (2)²

4 × -1 × 4

-16

PolarNik [594]3 years ago

4 0

Answer:

-16

Step-by-step explanation:

=4x^3y^2

=4(-1)^3(-2)^2

=-4*-1*4

=-4*4

=-16

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Answer:

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Step-by-step explanation:

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3 years ago

If a chain of 30 identical short springs linked end-to-end has a stiffness of 450 N/m, what is the stiffness of one short spring

Anastaziya [24]

The stiffness of one short spring is 13500 N/m

Solution:

We are given a chain with number of spring N = 30 and linked end to end ( in series) and stiffness of this chain is 450 N/m

We have to find the stiffness of one short spring

The springs are identical, which means they have same stiffness

The stiffness of one spring in series is given as:

$k_i = N \times k_s$

Where,

N is the number of springs

$k_i$ is the stiffness of one spring

$k_s$ is the stiffness of this chain

Substituting,

$N = 30\\\\K_s = 450$

Therefore,

$k_i = 30 \times 450\\\\k_i = 13500$

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