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3 years ago

Can someone help me with number 4 and 12

Mathematics

2 answers:

ira [324]3 years ago

8 0

4. Say x = 100, and so the iPad was $100. One year later, the iPad's value is equal to 0.82(x) or 0.82(100) = $82. The decrease was $18 from the original value. Therefore, another way to describe the change in the value of the iPad is C. 18% decrease.

12. So the Seahawks won 16 games last year, and 20 games this year. Here is an equation we can set up to help solve the problem:

20 = 16 + 16(x)

4 = 16x

x = 0.25

Therefore, the percent increase in the number of games the Seahawks won is 25%.

Hope this helps!! :)

Aliun [14]3 years ago

7 0

Answer:

4 .c is the right answer

Step-by-step explanation:

16=100%

20÷16=1.25 or 125%

125%-100%= 25% increase

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A research student measured the age of an ice layer at 70 m depth as 425 years. The accepted value reported is 427 years. What i

NNADVOKAT [17]

Answer:

0.47%.

Step-by-step explanation:

We have been given that a research student measured the age of an ice layer at 70 m depth as 425 years. The accepted value reported is 427 years.

We will use error percent formula to solve our given problem.

$\text{Error percentage}=\frac{|\text{Approx value}-\text{Exact value}|}{\text{Exact value}}\times 100$

$\text{Error percentage}=\frac{|425-427|}{427}\times 100$

$\text{Error percentage}=\frac{|-2|}{427}\times 100$

$\text{Error percentage}=\frac{2}{427}\times 100$

$\text{Error percentage}=0.0046838407494145\times 100$

$\text{Error percentage}=0.46838407494145$

Rounding to two decimal places:

$\text{Error percentage}\approx 0.47$

Therefore, the percent error of students value is approximately 0.47%.

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3 years ago

The high-school football team scored 19 points on touchdowns (worth 7 points if you count the extra point) and field goals (wort

Kazeer [188]

If they scored 5 times, they got 1 touchdown and 4 field goals.

Equation:

7 + 3 + 3 + 3 + 3 = 19.

5 0

3 years ago

A rectangular field has an area 28800 sq meter. Its length is twice as long as its width. What is the length of its sides?

mina [271]

W= width L= length = 2W

Area of Rectangle= Length * Widthsubstitute the area and the value of L in the formula
28,800 m^2= 2W * W
28,800= 2W^2divide both sides by 2 in an effort to isolate the variable w
14,400= W^2take the square root of both sides
√14,400= W^2
we want the negative and positive root of the radicand (the number under the radical symbol - 14,400 in this case)
120= w OR -120= w

LENGTHL= 2W= 2(120)= 240 meters

ANSWER: The side lengths are W= 120 m; L= 240 m. Even though W= -120 too, it is not a valid solution in this case since a field cannot have a negative value.

Hope this helps! :)

3 0

3 years ago

Which choice is the equation of the line that passes through the point (5, 19) and has a slope of

Liono4ka [1.6K]

Answer:

The equation is;

y = 12x-41

Step-by-step explanation:

Mathematically;

slope intercept form is;

y = mx + b

where m is slope and b is intercept

Since we already have the slope , the equation is;

y = 12x + b

To get b which is the y intercept, we simply substitute the value of the points given

Thus;

19 = 5(12) + b

19 = 60+ b

b = 19-60

b = -41

So the equation is;

y = 12x - 41

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3 years ago

Find the function value. tan495°

inysia [295]

Answer: -1

Step-by-step explanation:

You want to find an angle that is coterminal to 495. So, subtract 360 degrees until youre in the range of 0-360. I got 495 - 360 = 135°

Tangent is equal to $\frac{sin(theta)}{cos(theta)}$ , we already solved theta which was 135°

This next part is hard to explain to someone who doesnt know their trig circle, idk if you do. The angle 135 is apart of the pi/4 gang. So we know this is going to be some variant of √2/2. Sine of quadrant 1 and 2 is gonna be positive:

$sin135=\frac{\sqrt{2} }{2}$

Now lets do cosine of 135°, which again is apart of the pi/4 gang because its divisible by 45°. Its in quadrant 2 so the cosine will be negative.

$cos135=-\frac{\sqrt{2} }{2}$

The final step is to divide them. They are both fractions so you should multiply by the reciprocal.

$\frac{\sqrt{2} }{2} *-\frac{2}{\sqrt{2} } =-\frac{2\sqrt{2} }{2\sqrt{2} } =-1$

7 0

4 years ago

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