11. Jose has a jar with 77 coins. He as a mixture of quarters and dimes. If the total amount is $12.50, which of the following system of equations
can be used to find the total number of quarters, x, and dimes, y, that he
has in the jar?
X + y = 12.50 and .25x +.10y = 77
.25x + y = 77 and x +.10y = 12.50
X +.10y = 12.50 and .25x + y = 77
X + y = 77 and 25x + .10y = 12.50

x = ± 6i

step-by-step explanation:

x^2 = -36

take the square root of each side

sqrt(x^2) = sqrt(-36)

we know sqrt(ab) = sqrt(a) sqrt(b)

x = ±sqrt(36) sqrt(-1)

we know that sqrt (-1) = i

x = ± 6i

the correct answer option is d. la = πrs.

step-by-step explanation:

we know that for a right cone, the lateral surface area is given by:

lateral area of right cone =

here the value under the square root is equal to slant height so replacing this value by in the formula to get:

lateral area of right cone =

therefore, the correct answer option is d.

a≈380.13mi² would be your answer if the radius was 11 miles