PLEASE help ASAP im begging you

Mathematics

2 answers:

Annette [7]2 years ago

7 0

Answer:

only d is true since 5(3) = 15, which is greater than 14. 2.8 times 5 is exactly 14, so a and b don't make sense

Step-by-step explanation:

Hunter-Best [27]2 years ago

3 0

Answer:

#16 answer is D

#12 answer is A

Step-by-step explanation:

The reason #16 is D is because, if the variable "Y" is 1.5 then that would make the inequality 7.5 > 14. This is NOT true. If "Y" were 2, then it would be 10 > 14. This is NOT true either. If "Y" were 2.8, then that would make it 14 > 14. THIS IS NOT true either. BUT if it was 3, then that would make it 15 > 14. Which IS true.

Now the reason #12 is A is because the sign " $\geq$ " means "Greater than or equal to, no less then." And the SHORTEST/ Minimum height is 42 $\frac{1}{2}$ inches.

Hope this helps!

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F(x)= (x-2)(x-3)(x-5) simplify the right side. What is the equation?

Serga [27]

Answer:

x³ - 10x² + 31x - 30

Step-by-step explanation:

Given

(x - 2)(x - 3)(x - 5) ← expand the second pair of factors using FOIL

= (x - 2)(x² - 8x + 15) ← distribute

= x³ - 8x² + 15x - 2x² + 16x - 30 ← collect like terms

= x³ - 10x² + 31x - 30

5 0

2 years ago

A spotlight on the ground shines on a wall 12 m away. If a man 2 m tall walks from the spotlight toward the building at a speed

Olegator [25]

Answer:

The length of shadow decrease at 0.48 m/s.

Step-by-step explanation:

The distance of man from building = x

Thus initially, x = 12

It is given that dx/dt= -1.3 m/s

Let the shadow height = Y

Now solve for the $dy/dt$ when x=4

from the diagram (triangle) it can be seen similar triangles with similar base/height ratios.

$\frac{2}{12-x} = \frac{y}{12} \\Y = \frac{24}{12 - x} \\ \frac{dy}{dt} = \frac{24}{(12-x)^{2}} \times \frac{dx}{dt} \\at x=4, dy/dt \ becomes: \\\frac{24}{(12-4)^2} \times -1.3 \\= -0.48 m/s$