Greg is saving up his money to buy a new phone. The amount of money he has after any given week (w) can be given by the equation M = 90 + 15w. How many weeks will it take Greg to save up the $210 he needs to buy the phone?

It will take Greg 8 weeks to save up to buy the phone.

Step-by-step explanation:

Given equation is:

M = 90 + 15w

Here,

M represents the money saved

w represents the number of weeks

Greg wants to save 210

Putting M = 210 in the given equation;

210 = 90 + 15w

210 - 90 = 15w

15w = 120

Dividing both sides by 15

Hence,

It will take Greg 8 weeks to save up to buy the phone.

Once you know the height and width, multiply them to get the area of the square. To find the perimeter of the square, add all four sides together. To find the area of a triangle, multiply together two of the sides not the hypotenuse and then multiply that figure by 1/2.