3 years ago

Which expression correctly represents "twice the sum of four and a number"?

Mathematics

1 answer:

alexandr402 [8]3 years ago

5 0

Answer:

(4 + x) * 2

Step-by-step explanation:

twice the sum means the total will be multiplied by 2 and sum is addition. So 4 and a number (x).

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Solve i + j + t (3i - j) = -i + s (j)<br> In the context of Vector Equations of a Line

Oksana_A [137]

Answer:

r = i + j + (-2/3)(3i - j)

Step-by-step explanation:

Vector Equation of a line - r = a + kb ; where r is the resultant vector of adding vector a and vector b and k is a constant

if a = i + j ; b = t(3i - j) and r = -i +s(j)

for this to be true all the vector components must be equal

summing i 's

i + 3ti = -i; then t = -2/3

j - tj = sj; then s = 1-t; substitue t; s=1+2/3 = 5/3

so r = i + j + (-2/3)(3i - j) which will symplify to -i + 5/3j

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Bryan is taking a road trip to Dallas, Texas. His car can travel 315 miles with 18 gallons of gas. Bryan's s car holds 20 gallon

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The answer is A) 87.5 miles

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Differentiate. <br><br> y = ln(t)/t²

azamat

Remember

the deritivive of f(x)/g(x)=(f'(x)g(x)-g'(x)f(x))/((g(x))^2)

deritivive of lnx is 1/x
derivitive of t^2=2t

so

$\frac{(1/t)t^2-2tlnt}{(t^2)^2}$ =
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$\frac{1-2ln(t)}{t^3}$

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8. What is the result of (11x + 18i)(117 - 18i)?

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1287x + 342 +(-198x + 2106) i

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