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3 years ago

X+y= -4 2x -2y= 0 what best describes the solution to the system

Mathematics

1 answer:

padilas [110]3 years ago

3 0

Answer:

install photomath

Step-by-step explanation:

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Please help with the questions provided in the pictures below

Effectus [21]

Answer:

the answer is gonna be d

Step-by-step explanation:

8 0

1 year ago

Noah has $50. He wants to buy a cell phone case for $20 and some accessories. Each accessory costs $8. How many accessories (x)

levacccp [35]

Answer:

Noah can buy 2 accessories.

Step-by-step explanation:

Given:

Money Noah has = $50

Cost of Cell phone case = $20

Cost of each accessory =$8

Amount he wants to be left = $8

So Total Amount he he wants to spend on accessories and Cell phone case will be equal to Money Noah has minus Amount he wants to be left.

framing in equation form we get;

Total Amount he he wants to spend on accessories and Cell phone case = $\$50-\$8 =\$42$

No we need to find the number of accessories Noah can buy.

Let the number of accessories be 'x'.

Now we can say that;

Cost of Cell phone case plus Cost of each accessory multiplied by number of accessories should be less than or equal to Total Amount he he wants to spend on accessories and Cell phone case.

framing in equation form we get;

$20+8x\leq 42$

Subtracting both side by 20 we get using Subtraction property of Inequality.

$20+8x-20\leq 42-20\\\\8x\leq 22$

Now Dividing both side by 8 using Division property of Inequality we get;

$\frac{8x}{8}\leq \frac{22}{8}\\\\x\leq 2.75$

Now rounding to whole number we get ;

$x\leq 2$

Hence Noah can buy 2 accessories.

8 0

2 years ago

A cone has a height of 7ft and a radius of 4 ft. Which equation can find the volume of the cone ON A TIMER WILL GIVE BRAINLY

Yuri [45]

V=π x r2 x h/3 that’s the formula

6 0

2 years ago

Write what the expressions below best represent within the context of the word problem. mark had 3 times as many quarters as nic

Marta_Voda [28]

6 quarters and 2 nickles

2*3=6

6 quarters=1.50
2 nickles=.10
together that is 1.60!!

6 0

3 years ago

Q6.4☆ Points: 2 Suppose that Angela wants to use her sample to create a 68% confidence interval for the true population median o

Andrei [34K]

Answer:

She needs a sample size of 25.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1 - 0.68}{2} = 0.16$

Now, we have to find z in the Ztable as such z has a pvalue of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.16 = 0.84$ , so Z = 0.995.

Now, find the margin of error M as such

$M = z\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

The population SD is 2 grams.

This means that $\sigma = 2$

What is the minimum sample size she needs to create a confidence interval that has a width of 0.4 grams?

She needs a sample size of n.

n is found when M = 0.4. So

$M = z\frac{\sigma}{\sqrt{n}}$

$0.4 = 0.995\frac{2}{\sqrt{n}}$

$\sqrt{n} = \frac{0.995*2}{0.4}$

$(\sqrt{n})^2 = (\frac{0.995*2}{0.4})^2$

$n = 24.8$

Rounding up:

She needs a sample size of 25.

7 0

2 years ago