Answer:

120c²d - 1200cd² -10c + 100d

Step-by-step explanation:

We will first of all evalute inide the bracket then we expand it.

(10c6d-5)(2c-5d4)

=(60cd-5)(2c-20d)

= 60cd*2c -60cd*20d -5*2c +5*20d

= 120c²d - 1200cd² -10c + 100d

<h2><u>My complete work</u> :</h2>

Given :

Sum of all angles in a triangle = 180°

Which means :

- Thus, the value of x = 18

Measure of angle 15x-1 :

Thus, the measure of angle 15x-1 = 119°

Let us place 8 in the place of x to see if we have found out the correct measure of the angles :

Since the measures of all the angle sum up to form 180°, we can conclude that we have found out the correct measure of each of the angles.

Therefore, the value of x = 8

<h2><u>My answer</u> :</h2>

**Answer:**

The alternative hypothesis is .

The critical value is

**Step-by-step explanation:**

**It is claimed that proportion in favor of proportion A is greater than 60%.**

This means that at the null hypothesis, we test if the proportion is of at most 60%, that is:

At the alternative hypothesis, we test if the proportion is more than 60%, that is:

**What is (are) the critical value?**

The critical value is the value of Z with a p-value 1 subtracted by the standard significance level of 0.05, since we are testing if the mean is more than a value, so, looking at the z-table,