Answer:
7a + 2b
Step-by-step explanation:
Given
4a + 3b + 3a - b ← collect like terms
4a + 3a + 3b - b
= 7a + 2b
Answer:

Step-by-step explanation:
Given:
For every 1/2 of an hour that the turtle is crawling, he can travel 3/20 of a mile
Question asked:
At what unit rate is the turtle crawling?
Solution:
As here<u> time taken is given</u> and the <u>distance traveled is also given </u>and hence we will apply speed and distance formula to find rate of crawling of turtle.
Time taken by turtle = 
Distance which can be traveled by turtle = 


Therefore, the rate at which the turtle is crawling is 
Answer:

Step-by-step explanation:
Given


Required
Determine the percentage of the shaded cubes
First, we calculate the number of boxes:

Express as multiplication


This implies that there are 20 cubes in the box.
The percentage of the shaded cubes is:





<em>30% were shaded</em>
Answer:
Step-by-step explanation:
Decrease = 100 - 49 = 51
Percentage of decrease =

= 51%