1The symbol for speed is v and the symbol for time is t If v

1-The symbol for speed is v and the symbol for time is t. If v = 15t + 12, then what is t?

3- If f(x) = 7x³+4, then what is the derivative of f(x) with respect to x?

4-In a right triangle, the sine of an angle is 0.155 and the cosine of the same angle is 0.988. What is the tangent of the angle?

Solution

1. v=15t+12

t is the symbol of Time

t=v-12/15

2.Sin (x) = Opposite / Hypotenuse
=3.8/7.41
sin(x)=.5
x = sin-1(0.5)
x=30

4. The tangent of angle= Sine/ Cosine=.155/.988=.15