HELP ASAP PLS

Write an addition equation with a positive addend and a negative addend and a resulting sum of -8

Airida [17]

There's an infinite number of solutions. here's a few.
1+-9=-8
2+-10=-8
3+-11=-8
4+-12=-8
5+-13=-8
6+-14=-8

3 0

3 years ago

I need help with #22

maria [59]

Answer:

$4 = y \\ 4 = x$

Step-by-step explanation:

The isosceles triangle containing the side of y + 12 is congruent to 3x² - 32 [base angles are congruent], and if you look closer, they are also equivalent to all three sides of the equilateral triangle adjacent to the isosceles triangle. So, we will be working with alot gadgets here, if you know what I mean. Anyway, this is how we start out:

$5y - 4 = y + 12$

-5y - 5y

___________________

-4 = -4y + 12

-12 - 12

____________

-16 = -4y

___ ___

-4 -4

4 = y [Plug this back into both equations to get the value of 16.]

Next, you will set 3x² - 32 equal to 16:

$16 = 3{x}^{2} - 32$

+32 + 32

_________________

48 = 3x²

__ ___

3 3

16 = x²

4 = x [In this case, we want the NON-NEGATIVE root because inputting a -4 for x will not give us identical answers.]

I am joyous to assist you anytime.

6 0

4 years ago

She has 4 bottles for chestnut, 7 bottles of blonde, and 8 bottles of cherry. What does the ratio 8:19 represent in this problem

alexandr402 [8]

8:19 means there are 8 bottles of cherry from all 19

5 0

3 years ago

A carpet company advertises that it will deliver your carpet within 15 days of purchase. A sample of 49 past customers is taken.

Novosadov [1.4K]

Answer:

a) $H_0: \mu\leq15\\\\H_1: \mu>15$

b) The z-value (1.5) is smaller than z=1.645 (critical value), so it is in the "acceptance region". It failed to reject the null hypothesis.

c) The p-value (0.07) is greater than the significance level (0.05), so it failed to reject the null hypothesis.

d) In this case, the error we may hae comitted is a Type II error (failed to reject a null hypothesis that is false).

Step-by-step explanation:

We have to perfomr a hypothesis test on the mean, with known standard deviation of the population.

a) The null hypothesis is that the deliver time is 15 days or less.

The null and alternative hypothesis are then:

$H_0: \mu\leq15\\\\H_1: \mu>15$

The significance level is defined as 0.05.

b) The critical value of z for a one-side test (rigth side) and a significance level of 0.05 is z=1.645.

If the z-value for this sample is higher than 1.645, it is in the "rejection region".

Calculating the z-value:

$z=\frac{M-\mu}{\sigma/\sqrt{n}}=\frac{16.2-15}{5.6/\sqrt{49}}=\frac{1.2}{0.8}=1.5$

The z-value (1.5) is smaller than z=1.645 (critical value), so it is in the "acceptance region". It failed to reject the null hypothesis.

c) The p-value for z=1.5 is:

$P(z>1.5)=0.067$

The p-value (0.07) is greater than the significance level (0.05), so it failed to reject the null hypothesis.

d) There are two types of error:

Type I errors: happen when we reject a null hypothesis that is true.

Type II errors: happen when we failed to reject a null hypothesis that is false.

In this case, the error we may hae comitted is a Type II error.

3 0

3 years ago

Tina has a rectangular planter box. She decides that she needs more planting space so she triples the length, doubles the width

kirill [66]

Answer:

6

Step-by-step explanation:

The volume is proportional to length, so tripling the length multiplies the volume by 3.

The volume is proportional to width, so doubling the width multiplies the volume by 2.

Tina's new planter box is 3×2 = 6 times the volume of the original.

4 0

4 years ago