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4 years ago

HELPPPPP !!!

Mathematics

2 answers:

kifflom [539]4 years ago

7 0

Answer:

(A) the subtraction property of equality

Step-by-step explanation:

Given

The steps in the question

Require

Justify step 2 to 3

Write out step 2:

$-4x+9 = 2x+10$

Apply subtraction property by subtracting 2x from both sides

$-4x-2x+9 = 2x-2x+10$

$-6x+9 = 10$

Notice that the above equation is represented in step 3.

<em>Hence, option A answers the question.</em>

charle [14.2K]4 years ago

7 0

A. the subtraction property of equality

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andrew11 [14]

Answer:

A)Yes they should market the wax, because it melts before 55 seconds

C) Null hypothesis: mean <55 vs. Alternative hypothesis :mean =55

D) the value is 51.33 seconds

Step-by-step explanation:

The selected samples for the champion are : 57.9, 62.9, 50.6, 50.5,48.2,47.2,50.2 and 43.1

The mean is ;

Sum =57.9 + 62.9 + 50.6 + 50.5+48.2+47.2+50.2+ 43.1 =410.6

Mean= 410.6/8 =51.33= mean

Assuming Significant =0.05 thus applying this level will give you 51.28-51.38

if specifically, the mean time to finish their standard test course should be less than 55 seconds for a former Olympic champion, then the null hypothesis is correct

Then;

Null hypothesis: mean <55

Alternative hypothesis :mean =55

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3 years ago

8) 20% of 80 =<br> 40% of

pickupchik [31]

20/100 x 80
0.20 x 80
= 16

4 0

4 years ago

The variable z is directly proportional to x. When x is 11, z has the value 44. What is the value of z when x = 21?

dimulka [17.4K]

Directly proportional, both increase/decrease, Multiple k(constant you needed to solve for)..

Inversely --one increases as the other decreases, increase the denominator & fraction gets smaller.... So

Problem:

Dirextly to X (× by X)

Inversely to Y, (÷ by Y)

Z= k X/Y

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5 = k (X) ÷ (Y). And

X=15 and Y =9 becomes

5= k(15)/(9). Undo ÷9, ×9 both sides

45= k(15). Now undo ×15 by ÷15 both sides

45/15 = 3. So k=3, (also called your constant of variation)....and your Equation/Proportion becomes...

Z = 3X/Y

Use the new #s.... X=23, Y=14

Z= 3×23÷14 = 69/14. If they want spirochete answer divide and round to corresponding # if decimals

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3 years ago

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Answer:

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So it'll take him 10 weeks to finally reach that amount.

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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