Answer:
Call the sister's height x. The boy is twice as tall, so that's 2x. The father is 30 cm taller than the boy, so his height is 2x + 30. The combined height is 3.8m, which is 380cm. Now you can write an equation
x + 2x + 2x + 30 = 380
collect like terms
5x = 350
x = 70
the sister is 70cm tall, the boy is 2*70 = 140 cm, and the father is 140 + 30 = 170cm
Check that the heights add up to 3.8m: 70 + 140 + 170 = 380 cm = 3.8m. Correct
Step-by-step explanation:
hope it helps
Answer:
D & E
Step-by-step explanation:
1/ they're the only ones in the right format
2/ they're both highlighted on the graph
(im not completely confident in my answer, so don't drag me if im wrong.)
Answer:
d
Step-by-step explanation:
Answer: 49
Step-by-step explanation:
This polygon has 5 sides, meaning its interior angles add to 
.
