Evaluate the expression using the given value of the variable. 4 – 2x + 5x when x = 4 16 –24 –18 28

1 answer:

3 0

Answer:

A) 16

Step-by-step explanation:

The question is:

Evaluate the expression using the given value of the variable.

$4-2x+5x$ when $x = 4$

A) 16

B) -24

C) -18

D) 28

Solution:

Given expression:

$4-2x +5x$

Plugging in $x = 4$ in the expression

⇒ $4-2(4)+5(4)$

⇒ $4-8+20$

⇒ $16$

So the expression evaluates to 16 when we put $x = 4$

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inessss [21]

The number of minutes that would pass before they were 1870 feet apart is 5.47 minutes

Since one student runs at a speed of 180 feet per minutes, in time t minutes, he moves a distance of d = 180t.
Also, the second student runs at a speed of 160 feet per minute, in time t minutes, he moves a distance of d' = 160t.

Since they are initially 10 feet apart, their total distance apart after t minutes is D = d + 10 + d'

D = 180t + 10 + 160t

D = 340t + 10

<h3>Number of minutes before they are 1870 feet</h3>

Making t subject of the formula, we have

t = (D - 10)/340

Since they are 1870 feet apart after t minutes, D = 1870 feet.

t = (D - 10)/340

t = (1870 - 10)/340

t = 1860/340

t = 5.47 minutes

So, the number of minutes that would pass before they were 1870 feet apart is 5.47 minutes