The possible numbers that Melody could have picked are -4 and 4.
The operation that prevents us from knowing with 100% certainty the number Melody had picked is multiplication which is implied by the phrase "double the number".
Given, Let x be the number Melody had chosen.
Thus, tripling the number will give 3x, and
squaring this will result to (3x)² which is equals to 9x².
Dividing the square of the number by 2 and subtracting 30 from its quotient will give 42:
9x²/2 ₋ 30 = 42
9x²/2 = 42 ₊ 30
9x²/2 = 72
9x² = 72 × 2
9x² = 144
x² = 144/9
x² = 16
x = ±√16
x = ±4
x = ₊4 or x = 4
hence melody could have picked ₊4 or ₋4 numbers.
Learn more about Equations here:
brainly.com/question/22688504
#SPJ9
Answer:
80/6 =g
Step-by-step explanation:
13.33with the line over
You basically just get a equation that needs to be answered and grab the answer and minus it by one of the two digits in front. Example: 3+2=5 is equal to 5-2=3
Answer:
1)7*3
4)m^2
Step-by-step explanation:
The first four problems deal with the area of the rectangle, or length times width(7*3,m*m=m^2).
The last four problems are dealing with adding areas. Find the area of the two rectangles(length times width), then add them together to find the total area.
The closest you can get without going over exactly 28 is 15