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3 years ago

Hey can anyone help plz?

1 answer:

8 0

We have been given an expression $2\sqrt{28} -5\sqrt{63}$ and we are asked to find correct option from the given choices.

Let us simplify our expression.

$2\sqrt{28} -5\sqrt{63}$

First of all we will take out perfect squares from our radical.

$2\sqrt{7\cdot4} -5\sqrt{7\cdot9}$

$2\sqrt{4} \cdot\sqrt{7} -5\sqrt{9} \cdot\sqrt{7}$

$2\cdot2\sqrt{7} -5\cdot3\sqrt{7}$

$4\sqrt{7} -15\sqrt{7}$

$-11\sqrt{7}$

Our expression simplifies to $-11\sqrt{7}$ , therefore, option C is the correct choice.

You might be interested in

15 = 5/ 3(x + 12) solve for x in simplest form

Readme [11.4K]

Answer:

x= -10 1/5 or -10.2

Step-by-step explanation:

5 0

3 years ago

Simplify completely: 3x+18 / 18 1) x 2) 3x 3) x+6 / 6 4) x+18 / 6 ...?

drek231 [11]

3(x + 6)/18

= x + 6 /6

5 0

3 years ago

1.Dylan bought 3.5 meters of cloth for 94.5 pesos.How much does 1 meter og the cloth cost?

muminat

1.Dylan bought 3.5 meters of cloth for 94.5 pesos.How much does 1 meter og the cloth cost?

PLEASE I NEED IT NOW CAUSE IM EXPERIENCING DESPRESS I HOPE EVERYONE COULD HELP him

8 0

3 years ago

An entrepreneur is considering the purchase of a coin-operated laundry. The current owner claims that over the past 5 years, the

Bond [772]

Answer:

a. Z-test of a population mean.

Step-by-step explanation:

The current owner claims that over the past 5 years, the average daily revenue was $675 with a standard deviation of $75.

This means that we have a large sample, which means that we can consider this to be the standard deviation for the population, which eliminates the t-test, leaving options a and c.

Population mean or proportion?

Mean, as a proportion is a value between 0 and 1, while average revenue may have lots of possible values. So the answer is given by option A.

6 0

3 years ago

In a one-way ANOVA, the __________ is calculated by taking the squared difference between each person and their specific groups

guapka [62]

Answer:

In a one-way ANOVA, the $SS_{within}$ is calculated by taking the squared difference between each person and their specific groups mean, while the $SS_{between}$ is calculated by taking the squared difference between each group and the grand mean.

Step-by-step explanation:

The one-way analysis of variance (ANOVA) is used "to determine whether there are any statistically significant differences between the means of two or more independent groups".

The sum of squares is the sum of the square of variation, where variation is defined as the spread between each individual value and the mean.

If we assume that we have p groups and each gtoup have a size $n_j$ then we have different sources of variation, the formulas related to the sum of squares are:

$SS_{total}=\sum_{j=1}^{p} \sum_{i=1}^{n_j} (x_{ij}-\bar x)^2$

A measure of total variation.

$SS_{between}=\sum_{j=1}^{p} n_j (\bar x_{j}-\bar x)^2$

A measure of variation between each group and the grand mean.

$SS_{within}=\sum_{j=1}^{p} \sum_{i=1}^{n_j} (x_{ij}-\bar x_j)^2$

A measure of variation between each person and their specific groups mean.

8 0

3 years ago