3 years ago

Multiply and completely simplify: (4x+6) (x-1) PLEASE HELP NOW

Mathematics

1 answer:

nikdorinn [45]3 years ago

6 0

Answer:

-2.333333333

Step-by-step explanation:

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Which expressions are perfect cubes? -1,000 0 2721 343p O n30 ebo... -1

Vikki [24]

Answer: -1000, 27r^21, g^3h^30, and -1

Step-by-step explanation:

4 0

3 years ago

Jackson is three times as heavy as Andrew. If the sum of their weight is 360 pounds, find Andrews weight

Delicious77 [7]

Answer: Andrew = 90 pounds

Explanation:
Assume Andrew weight is X
Since Jackson weight is 3 times Andrew
Then it’s 3x

3x + x = 360
4x = 360
x = 90

5 0

3 years ago

Read 2 more answers

The amount of time Ricardo spends brushing his teeth follows a Normal distribution with unknown mean and standard deviation. Ric

Papessa [141]

Let $X$ denote the number of minutes spent brushing his teeth, and let $\mu$ be the mean and $\sigma$ the standard deviation for this distribution.

$\mathbb P(X$

The z-score corresponding to this probability is approximately $z=-0.2533$ , which means

$\dfrac{1-\mu}\sigma=-0.2533\iff\mu-0.2533\sigma=1$

Next, (note the sign change)

$\mathbb P(X>2)=0.02\implies\mathbb P(X\le2)=\mathbb P\left(\dfrac{X-\mu}\sigma\le\dfrac{2-\mu}\sigma\right)=0.98$

The corresponding z-score is approximately $z=2.0538$ , so you have

$\dfrac{2-\mu}\sigma=2.0538\iff\mu+2.0538\sigma=2$

Solving the two equations for $\mu$ and $\sigma$ , you'll find that the mean is approximately $\mu=1.1098$ and the standard deviation is approximately $\sigma=0.4334$ .