Find the GCF of 30, 60, and 78.

Step-by-step explanation:

6

Step 1 write each number as a product of its prime numbers

30=2*3*5

60=2*2*3*5

78=2*3*13

Find the common factors between the stree values in this case it is 2 and 3 then multiply the answer is 6

the anwser is d) 75°

step-by-step explanation:

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15