Answer:
Emily has 5 apples!!!
Step-by-step explanation:
Ok,
Let the apples Emily has be 'x'
Now,
× + 25= 30
Transpose 25 to RHS
× = 30-25
× = 5
Therefore, Emily has 5 apples :D
Hope it helps!!!
Answer:
135 is the distance
Step-by-step explanation:
I subtracted the numbers.
I hope this helped and have a great day!
(please vote this brainliest)
Let's consider the man rows to point D, at x km from C...so we have DB= (4-x) km
<span>AC = 4 km </span>
<span>CD = x km </span>
<span>AD = √(4^2 + x^2) ..... Distance travelled through river </span>
<span>Travel on land = (4 - x) </span>
<span>f(t) = distance / time </span>
<span>= [(x^2 + 16)^1/2]/6 + (4-x)/8 </span>
<span>f'(t) = 1/6 * (x^2 + 16)^(-1/2) * (2x) + 1/8 * (-1) </span>
<span>= x / [3*√(x^2 + 16)] -1/8 </span>
<span>= [8x - 3*√(x^2 + 16)] / [24*√(x^2 + 16)] </span>
<span>At f'(t) = 0 </span>
<span>0 = 8x - 3*√(x^2 + 16) </span>
<span>8x = 3*√(x^2 + 16) </span>
<span>64x^2 = 9(x^2 + 16) </span>
<span>x = 12/√55 x>0 </span>
<span>= 1.618 Km .... distance travelled throgh water </span>
<span>4 - x = 2.382 Km ......distance on foot</span>
Answer:
D. 80
Step-by-step explanation:
Given:
f(x) = 5x - 4,
g(x) = x² - 1
Required:
(g o f)(-1)
SOLUTION:
(g o f)(-1) = g(f(-1))
Plug in -1 for x into the function, f(x) = 5x - 4:
g(f(-1)) = g(5(-1) - 4)
= g(-5 - 4)
= g(-9)
Plug in -9 for x in the function, g(x) = x² - 1
g(-9) = (-9)² - 1
= 81 - 1
= 80.
Therefore, (g o f)(-1) = g(f(-1)) = 80
D. 80 is the correct answer.