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Oksanka [162]
2 years ago
6

On a spelling quiz, Lily got 16 out of 20 questions correct. Select all the expressions that show the ratio of Lily’s correct an

swers to incorrect answers.
A. 45

B. 164

C. 4:1

D. 5:4

E. 16:20
Mathematics
1 answer:
levacccp [35]2 years ago
8 0

Answer:

E.

Step-by-step explanation: Unless you accidentally swapped the 5 and 4 around for D, then the answer is just E.

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graph?

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The equation of a line is y=-2.5x+3. Which one of these points lies on this line?
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On a popular television quiz show, contestants gain points for getting questions correct, and lose points for getting the answer
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Preston have to get some correct and some incorrect answers. 
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2 questions here:
solmaris [256]
<span>1. Make y the subject 
a) 4y=12x+18
y = 3x + 4.5

b) 2x=7-3y
3y = -2x + 7
y = -2/3x + 7/3

2.
a) what is the equation of the line which passes through both (-2,-4) and (6,16)

slope = (16 + 4)/(6 +2) = 20/8 = 2.5
y = mx + b
-4 =2.5(-2) +b
-4 = -5 +b
b = 1

equation
y = 2.5x + 1


b) what is the equation of the line perpendicular to y= 1/2X + 7 passing through point (3,9)

</span>y= 1/2X + 7
slope = 1/2

slope of line perpendicular = -2

passing through point (3,9)

y = mx + b
9 = -2 (3) + b
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equation

y = -2x + 15

6 0
3 years ago
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If the population of a country increases at a rate of 1.5% annually and its current population is 430,000, how many years will i
Sphinxa [80]

Answer:

That is 74 years.

Step-by-step explanation:

1.5% = 0.015.

The equation for the rate of growth is P = 430,000(1.015)^n where n is the number of years.

Triple the population  is 430,000 * 3 =  1,290,000, so:

1,290,000 = 430,000(1.015)^n

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Taking logs of both sides:

n log 1.015 = log 3

n = log 3 / log 1.015  =  73.8 years

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3 years ago
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