Answer:
-1 for question 1, -11 for question 2, 7 for question 3
Step-by-step explanation:
53-49=4
4 times 12=48. the unknown number is 48
Answer:
1,436.03
Step-by-step explanation:
V=4/3*pi*r^3
V=4/3*3.14*7^3
V=1,436.03
Step-by-step explanation:
the solutions for a quadratic equation is
x = (-b ± sqrt(b² - 4ac))/(2a)
in our case
a = 1
b = -4
c = k
x = (4 ± sqrt(16 - 4k))/2 = 2 ± sqrt(4 - k)
x1 = 2 + sqrt(4 - k)
x2 = 2 - sqrt (4 - k)
x1 = 2 + x2
2 + sqrt(4 - k) = 2 + 2 - sqrt(4 - k)
2×sqrt(4 - k) = 2
sqrt(4 - k) = 1
4 - k = 1
k = 4 - 1 = 3
x1 = 3
x2 = 1
