Krystal used a number line to add. She started counting at 10, and then she counted until she was on the number −4 on the number line. What number did she add to 10?

6

Step-by-step explanation:

BECAUSE YOU ACT LIKE IF IT IS THE SAME AND THEN YOU SUBTRACT AS IF THEY ARE POSITIVE THEN YOU KEPP THAT NEGATIVE AND THEN YOU GET 6

36 girls

step-by-step explanation:

the 48 boys is 4 parts of the ratio

divide 48 by 4 to obtain one part of the ratio

= 12 ← 1 part of the ratio

3 parts = 3 × 12 = 36 ← number of girls

126.66 m²

step-by-step explanation:

the pertinent area formula is a = πr², where r is the radius.

here, a = π(6.35 m)² = 40.32π, or approximately 126.66 m²