3 years ago

Explain why the expression 7•3x is not equal to the expression 21x

1 answer:

5 0

The expression 7•3x is not equal to the expression 21x. You might think that the two expressions are the same since 7x3 is 21 but the first expression is a dot product. This kind of expression includes the magnitude and direction of the vector in an expression, for example, 7•3x. The second expression, 21x, expresses only the magnitude and does not include the direction.

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If (x − 2) ∶ 5 = 7 ∶ 9, then find the value of x.

WARRIOR [948]

Answer:

x=53/9

Step-by-step explanation:

(x-2):5=7:9

9x-18=35

9x=35+18

9x=53

x=53/9

4 0

2 years ago

Mark purchased a 20 foot long sub for a party he cuts the sandwich into 5/12 foot sections into how many pieces does he cut the

vazorg [7]

Answer:

48 pieces

Step-by-step explanation:

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2 years ago

Solve for x show all work -2× + 5=4× -7

Anestetic [448]

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6 0

3 years ago

Read 2 more answers

Prove that for all integers a and b, if a mod 7 = 5 and b mod 7 = 6 then ab mod 7 = 2.

sergiy2304 [10]

Hello :
if : a ≡ 5 ( mod 7) ....(1)
b ≡ 6 ( mod 7) ...(2)
(1)×(2) : ab ≡ 30 ( mod 7)
but : 30 = 7×4 + 2 ..... so : 30 ≡ 2 ( mod 7)
then : ab ≡ 2 ( mod 7)

6 0

2 years ago

Solve 11sinθ-2=2 for a value of θ when 0≤θ≤π/2.? How do you solve the second problem?

Sergio [31]

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6 0

3 years ago