Ask question

Ask question

All categories

2 years ago

15

Marie is saving $75 each week so she can buy a new laptop which costs $1200. She has already saved $125. Find the minimum number

of weeks she will have to save in order to be able to make this purchase.

1 answer:

hjlf2 years ago

5 0

Answer:

Step-by-step explanation:

$125+75w\ge 1200\\ \\ 75w\ge 1075\\ \\ w\ge 14.33\\ \\ \text{So she must save for at least 15 weeks.}$

You might be interested in

An object is dropped from a hot-air ballon 1296 feet above the ground. The height of the object is given by: h = -16(t-9)(t+9) w

Reil [10]

Answer:

Step-by-step explanation:

So hitting the ground i think you just set the equation equal to 0

-16(t-9)(t+9)=0

t=0,9,-9 so it will take 9 second since the negative wont be the right choice.

I hope this helps?

4 0

2 years ago

What’s the solution for 2x =8

viktelen [127]

Answer:

4

Step-by-step explanation:

2x = 8

x = 4

6 0

2 years ago

Read 2 more answers

A video store specializes in three types of movies: children's, American West, and horror. It's known that:

xenn [34]

X, y, z denote children's movies, western movies, and horror movies, respectively. The related system of equations is formed and solved.

$\left\{\begin{matrix} \qquad\qquad\ \dfrac{60}{100}x + \dfrac{50}{100}y =\dfrac{30}{100}(x+y+z)\\ \dfrac{20}{100}x+ \dfrac{60}{100}y+ \dfrac{60}{100}z= \dfrac{1}{2}(x+y+z) \\ \ \ \ x+100=y \end{matrix} \right.\$

Simplifying the system of equations, we have

$\left\{\begin{matrix} 3x + 2y -3z=0\\ -3x+ y+ z= 0 \\ \ \ \ x+100=y \end{matrix} \right.\ \ \Longrightarrow \ \left\{\begin{matrix} 5x-3z=-200\\ -2x+ z= -100 \end{matrix} \right.\$

$\ \ \ 5x-3z=-200\\\underline{-6x+3z=-300} \ \Rightarrow \ x=500\\\ \ -x+0= \ 500$

$y&=500+100=600\\ z&=3(500)-600=900$

The video store has 500 children's movies, 600 westerns and 900 horror movies.

6 0

1 year ago

3.<br> + 4(4x - 3) = 4(6x + 4) +4

allsm [11]

Answer: -4

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers

How to calculate concentration with just the absorbance and % transmittance measurements from a spectrometer?

Natali [406]

Answer:

A=ε*l*c

A= 2- log₁₀ % T

Step-by-step explanation:

There is a linear relationship between the concentration of a sample and absorbance according to Beer-Lambert Law.

A=ε*l*c

where;

A=absorbance

ε=absorption coefficient

l=path length

c=concentration

Because % transmittance is transmittance value multiplied by 100 then, the equation that will allow us calculate absorbance from % transmittance value will be;

A= 2- log₁₀ % T where T is transmittance.

8 0

2 years ago