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2 years ago

Lol i need help again plzz

Mathematics

1 answer:

Len [333]2 years ago

7 0

X would equal 81 because the square root of 81 is 9.

9 x 9 = 81

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PLEASE HELP ASAP!!! CORRECT ANSWER ONLY PLEASE!!!

Nady [450]

Answer: b) -0.625

<u>Step-by-step explanation:</u>

The formula for the z-score is:

$z=\dfrac{x-\mu}{\sigma}\\\\\bullet z \text{ is the z-score}\\\bullet x \text{ is the value}\\\bullet \mu \text{ is the mean}\\\bullet \sigma \text{ is the standard deviation}\\\\z=\dfrac{6-8}{3.2}\\\\\\.\ =\dfrac{-2}{3.2}\\\\\\.\ =\large\boxed{-.0625}$

6 0

2 years ago

Let u=<-5,2>, v=<-2,6>. Find 4u+3v.

charle [14.2K]

Answer:

$\large\boxed{4\vec{u}+3\vec{v}=}$

Step-by-step explanation:

$\vec{u}=;\ \vec{v}=\\\\4\vec{u}==\\\\3\vec{v}==\\\\4\vec{u}+3\vec{v}=+==$

4 0

2 years ago

The daily cost of producing x high performance wheels for racing is given by the following function, where no more than 100 whe

algol [13]

Answer:

The production would be 25 wheels,

Lowest average cost is $ 123.75

Step-by-step explanation:

Given cost function,

$C(x) = 0.09x^3 - 4.5x^2 + 180x$

Where,

x = number of wheel,

So, the average cost per wheel,

$A(x) = \frac{C(x)}{x}=\frac{0.09x^3-4.5x^2 + 180x}{x}=0.09x^2 - 4.5x + 180$

Differentiating with respect to x,

$A'(x) = 0.18x - 4.5$

Again differentiating with respect to x,

$A''(x) = 0.18$

For maxima or minima,

$A'(x) = 0$

$0.18x - 4.5 = 0$

$0.18x = 4.5$

$\implies x = \frac{4.5}{0.18}=25$

For x = 25, A''(x) = positive,

i.e. A(x) is maximum at x = 25.

Hence, the production would be 25 wheels for the lowest average cost per wheel.

And, lowest average cost,

A(x) = 0.09(25)² - 4.5(25) + 180 = $ 123.75

5 0

3 years ago

If 7 giant solar power plants generate 1.3 gigawatts (GW) of energy to power 900,000 homes, how many gigawatts can 21 giant sola

Mice21 [21]

Answer:

2,700,000 homes

Step-by-step explanation:

6 0

2 years ago

Use the formula d=rt. Find t for r=48.3m/h and d=545.79m.

Korolek [52]

Answer:

t = 11.3 hours

Step-by-step explanation:

The formula d = rt stands for distance = rate x time. The problem gives you the rate, or r = 48.3 m/h, and the distance, or d = 545.79m. To solve for 't', you can plug the values given and divide:

d = rt or 545.79 = 48.3(t)

Divide both sides by 48.3: 545.79/48.3 = 48.3t/48.3

Solve for t: t = 11.3 hours

6 0

2 years ago