3 years ago

For which of the values of a and b is the following statement not true?

Mathematics

1 answer:

Vedmedyk [2.9K]3 years ago

7 0

A B D are all false and C is true

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60 − (7 + 4) × 5 what is the answer

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Step-by-step explanation:

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2 years ago

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Your dog is 8 years younger than your friend. In 2 years, your friend will be three times as old as your dog. How old is your do

ra1l [238]

Answer:

Dog is 2 years old

Step-by-step explanation:

Let dog's age = d

Let friend's age = f

Your dog is 8 years younger than your friend:

d +8 = f

In 2 years, your friend will be three times as old as your dog:

3(d+2) = (f+2)

3d+6 = f+2

3d = f - 4

(sub in f=d+8 from above)

3d = f - 4

3d = d+8 - 4

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2 years ago

**A rock dropped from a 100 foot tower.

mars1129 [50]

Answer:

2.83 s

Step-by-step explanation:

We are given that

$h(t)=-16t^2+10t+100$

When a rock reached the ground then h(t)=0

$-16t^2+10t+100=0$

$16t^2-10t-100=0$

Using quadratic formula

$x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$

$t=\frac{10\pm\sqrt{(-10)^2-4\times 16\times (-100)}}{2(16)}$

$t=\frac{10\pm\sqrt{100+6400}}{32}$

$t=\frac{10+\sqrt{6500}}{32}=2.83$

$t=\frac{10-\sqrt{6500}}{32}=-2.2$

Time cannot be negative .Therefore, negative value of t can not be possible.

Hence, the rock takes 2.83 sec to reach the ground.

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3 years ago

ms smith paid 125 to have her hair colored and cut. If she tips her hairdresser 15% of her bill, how much was the tip

elena-s [515]

The tip was $125 * 0.15, or $18.75.

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2 years ago

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-5 because the number is before zero which irrational number

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