Answer:
105,3≈105
Step-by-step explanation:
sin 72°=19/20
sin 72°=100/x
x=(20*100)/19=105,3
x=BC
x- is hypotenuse
i calculated with calculator
Answer:
1. 3
3. 10
Step-by-step explanation:
1. Write a proportion by writing each ratio as a fraction and setting the fractions equal. A proportion is an equation where two ratios are equal to each other. Then cross multiply denominator and numerator of each fraction to solve.

2. Repeat same process as #1.
3. The ratio of girls to boys is 3:2. There are 15 girls. write a proportion to solve using b as the number of boys.

There are 10 boys.
Answer:
Check pdf
Step-by-step explanation:
Answer:
f(x)=(x-6)(x-(-7))
Step-by-step explanation:
Foiled:
0 = x + x - 42
Answer:
17
Step-by-step explanation: