You can solve this one by adding their rates, but you have to invert the numbers they give you to find the rate. Rate is measured in something per unit of time, and "per" indicates division. So the rates are: 1/3 of an hour (Sally) and 1/6 of an hour (Steve). So add the rates: 1/3 + 1/6 = 1/2. (1/3 is 2/6, and 2/6 + 1/6 = 3/6). Since their combined rate is 1/2 of a room in one hour, it takes them two hours to paint the room.
This answer makes sense: It takes Sally three hours by herself; with Steve's help, she's faster, but not THAT much faster, because he's pretty slow. You can often spot-check word problem answers like this by giving it a common sense once-over. If we came up with four hours, that would clearly be wrong: it should take her LONGER if she's getting help.
Since the perimeter of the square is 28ft, the side length of the square is 7ft.
Hence, the area of the square is 49 square feet.
Answer:
The value is 58
Step-by-step explanation:
8x + 2y
8(5) + 2(9)
40+18
58
Answer:
2x + 7x – 10
2x2 + 9x – 7
Step-by-step explanation:
First off,congruent triangles are triangles that are equal to another,having the same area,length of sides and angles.
Judging visually,the triangles that are congruent would be:
C and E-as they are both in smaller size.
D and F-as they are both significantly irregular.
That would left A and B:
A-it is very large in size that none other could match
B-it is the only isosceles triangle.
Thus the answer is A and B as they do not match with any others.
Hope it helps!
