A line with a slope of zero is a horizontal line. Although two lines that have a slope of zero will result in two parallel lines, not all parallel lines are horizontal lines. Since the question is asking for which statement <u>must</u> be true, option A is incorrect.

If the slopes of two lines are negative reciprocals, they are perpendicular to each other. This is because the product of the gradients of 2 perpendicular lines is -1. Let the gradient of the first line be A and the other be B.

AB= -1

$A = - \frac{ 1}{B}$

$B = - \frac{1}{A}$

Thus, option B is incorrect too.

Undefined slopes gives vertical lines. Like option A, if two lines have an undefined slope, they will be parallel to each other. However since parallel lines are nit necessarily vertical lines, option C is also incorrect.

4 0

2 years ago

Read 2 more answers

Your employer has 600 business cards printed for you, and you give away 280 of them. To the nearest hundredth, what percent of t

Ulleksa [173]

If you gave away 280 of 600 business cards and you would like to know what percent of the cards is left, you can calculate this using the following steps:

600 - 280 = 320 cards are left

320 / 600 = 8 / 15 = 0.5333 = 53.33%

The correct result is D. 53.33%.

7 0

3 years ago

Read 2 more answers

Find angle A and angle E

riadik2000 [5.3K]

Answer:

m∠A = 50°

m∠E = 50°

Step-by-step explanation:

7x - 17 and 2x + 8 are same side exterior angles. They have a sum of 180°.

7x - 17 + 2x + 8 = 180

9x - 9 = 180

9x = 189

x = 21

∠A and 7x - 17 are supplementary. ∠E and 2x + 8 are vertical angles.

m∠A + 7x - 17 = 180

m∠A + 7(21) - 17 = 180

m∠A + 147 - 17 = 180

m∠A + 130 = 180

m∠A = 50

m∠E = 2x + 8

m∠E = 2(21) + 8

m∠E = 42 + 8

m∠E = 50

8 0

3 years ago

The pieces of a puzzle are placed half by Giulio, one fifth by Marco and Fabrizio in equal parts, while Michele arranges on the

denis23 [38]

Answer:

Not exactly sure but I think it should be 30 pieces

Step-by-step explanation:

3 0

2 years ago