Answer:
4a - 13
Step-by-step explanation:
● 7a - 2a - a - 13
● (7a - 2a - a) -13
● (5a-a) -13
● 4a -13
It should b 5.6cm if I’m not mistaken
Answer:
Shape Number of Lines of Reflection Description
equilateral triangle 3 3 perpendicular bisectors of the sides
regular heptagon 7 7 perpendicular bisectors of the sides
regular octagon 8 4 perpendicular bisectors and 4 lines joining pairs of opposite vertices
Step-by-step explanation:
Subst for f and t in...
9t+3ft+12 = 9×21 + 3×3×21 + 12 = 390