Mara has 3 times as many dollars as her brother, Timmy. If Mara is given $20 by their mother, she will have 7 times as many dollars as Timmy. How many dollars does Timmy have?

$5

Step-by-step explanation:

Using algebra to solve this problem.

Let 'x' be Timmy’s amount.

->Mara has 3 times as many dollars as her brother i.e 3x dollars

->If Mara is given $20 by their mother, then expression would be

3x + 20

Since Mara’s new amount is supposed to be seven times Timmy’s

current amount, this forms an equation

3x + 20 = 7x

Solving for 'x'

7x -3x=20

4x = 20

x=20/4

x=5

Timmy has an amount of $5

answer: 204

step-by-step explanation:

we are told that the revenue is

x⋅(4080−10x)=−10x^2+4080x

this is a quadratic function, so to maximize it we should find the x-value of its vertex. recall that the x-value of the vertex of the parabola ax^2+bx+c is given by the formula −b/2a.

so in this case, we have a=−10 and b=4080, so the x-value of the vertex is

−b/2a= −(4080)/2(−10)=204

from the sentence, "tomorrow morning, akiko will arrive an hour late" depicts a third person perspective because it doesn't use any pronoun to replace akiko, the subject of the sentence, and it is in singular form since akiko is only one person.