Answer:
1 = 21 m
2 = 120 cm
3 = 84 cm
4 = 3 km
5 = 10 m
6 = 55 mm
7 = 60 cm
8 = 500 mm
Step-by-step explanation: you see where it says "perimeter = 3s" right? for each question you have to replace "s" with the number given so for the first one it would be 3 x 7. You had to do the same thing with the others but sometimes we get confused in math :D
12×10+15y=390
120+15y=390
15y=270
y=18
So 18 adult t-shirts were sold
Answer:

Step-by-step explanation:
We have been given that the vertices of a triangle are A (5, 0), B (x, y) and C (25, 0). We are asked to find the area of the given triangle.
We will use area formula for triangle with vertices A, B and C as given below:

Upon substituting the given coordinates of points A, B and C in above formula, we will get:






Therefore, the area of the given triangle would be
.
Answer:
Step-by-step explanation:
2.6666666667
Answer:
C) Neither
Step-by-step explanation:
These two equations are not parallel, because they don't have the same slope. And they're not perpendicular to each other either, because perpendicular lines have negative reciprocals of the slopes. Therefore, the answer is C) Neither.