What is the surface area of a right cylinder which has a base with radius 9 units and has a height of 12 units
508.7 units squared
678.2 units squared
1,186.9 units squared
1,256.0 units squared

step-by-step explanation:

hjkj

hey! so 1 (25) out of 4 (100) is 25 so your answer is 25%. it's like quarters!

the 8 in 8,420 is in the thousands place so it's value is 8 thousand.

the 8 in 6,870 is in the hundreds place so it's value is 8 hundred.

divide 8000 by 800 to find the answer:

8000 / 800 = 10

the 8 in 8,420 is 10 times greater than the 8 in 6,870

"standard form:

3x2 + 14x − 10 = 0

solutions based on quadratic formula:

x1   = −14 − √ 142 − 4×3×(−10) /   2×3   = −14 − 2 × √ 79 /   6   ≈ −5.296

x2   = −14 + √ 142 − 4×3×(−10) /   2×3   = −14 + 2 × √ 79 /   6   ≈ 0.629