Find an equation of the tangent line to the curve at the given point. y = x , (4, 2) step 1 to find the equation of a line, we need the slope of the line and a point on the line. since we are requested to find the equation of the tangent line at the point (4, 2), we know that (4, 2) is a point on the line. so we just need to find its slope. the slope of a tangent line to f(x) at x = a can be found using the formula m tan = lim x→a f(x)-f(a)/ x-a

the answer is C

Step-by-step explanation:

= 5

step-by-step explanation:

to find the 15th term substitute n = 15 into the nth term formula

= (- 3 × 15 ) + 50 = - 45 + 50 = 5

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.