Answer:

Step-by-step explanation:
El área del rectángulo se halla a través de la siguiente fórmula: (The area of the rectangle is obtained by the following formula:)

Donde el área y
se miden en centímetros cuadrados y centímetros, respectivamente. (Where area and
are measured in square centimeters and centimeters, respectively)
Ahora,
se reemplaza y se encuentra el valor numérico del área: (Now,
is substituted and numerical value of area is finally determined:)
![A = [40\,cm - 2\cdot (4\,cm)]\cdot (4\,cm)](https://tex.z-dn.net/?f=A%20%3D%20%5B40%5C%2Ccm%20-%202%5Ccdot%20%284%5C%2Ccm%29%5D%5Ccdot%20%284%5C%2Ccm%29)

We can set up a proportion since we know the ratio between the # of purple marbles and the # of green marbles.
A ratio is a way to compare two different values: for every 8 purple marbles there are 5 green marbles
<h2>

</h2><h2 /><h2>when we cross multiply, we get 5p = 240 </h2><h2>we divide both sides by 5 to isolate the variable </h2><h2 /><h3><u>There are 48 purple marbles </u></h3>
Answer:
a < 4
Step-by-step explanation:
7 + a < 11
Subtract 7 from each side
7+a-7 <11-7
a < 4