Answer:
3. C
4. D
Step-by-step explanation:
3.
Once 
4.
A quadratic equation has no real roots when the discriminant (
) is negative. 
.
Let's try all the equations:
(A)
(B)
(C)
(D)
Sorry don’t know this one
Answer: Since 10° is less than 90, we can express this in terms of a co-function. cos(θ) = sin(90 - θ) cos(10) = sin(90 - 10) cos(10) = sin(80)
Step-by-step explanation: Note that cos10° is periodic: cos (10° + n × 360°) = cos 10 degrees, n . There are more formulas for the double angle (2 × 10°), half angle ((10/2)°) as well as the sum, difference and products of two angles such as 10° and β.
Answer:
The answer is C.3(x+3)/7
Step-by-step explanation:
