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4 years ago

15

A sprinter started his race slowly and then increase his speed by 12.5 miles per hour to reach a top speed of 21 miles per hour

what was the sprinters speed before he increased his speed

1 answer:

IRINA_888 [86]4 years ago

8 0

21 mph - 12.5 mph = 8.5 mph

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I need help solving it

blagie [28]

X2-64=0
x2=64

x=8 because when multiplied by itself, and plugged back in, it works

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3 years ago

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Which equation in slope intercept form contains the point (4, -1) and has a slope of 3

Nimfa-mama [501]

Answer:

Final answer is $y=3x-13$ .

Step-by-step explanation:

Given that slope of the line is m=3

Plug the given point (4,-1) and the slope m=3 into point sloep formula:

$y-y_1=m\left(x-x_1\right)$

$y-(-1)=3\left(x-4\right)$

$y+1=3\left(x-4\right)$

$y+1=3x-12$

$y=3x-12-1$

$y=3x-13$

Which looks like slope intercept form of line y=mx+b

Hence final answer is $y=3x-13$ .

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3 years ago

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san4es73 [151]

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4 years ago

14 oz has 98 calories how many calories are there in a 23 oz iced tea

Alex Ar [27]

Answer:

the answer is 230 calories :)

Step-by-step explanation:

divide 160 by 16 to find out how much 1-oz is then times it by 23 to get the amount of calories in 23-oz. There you go I hope it helps :)

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4 years ago

A rectangle has a length of x and a width of 5x^3+4-x^2. What is the polynomial that models the perimeter of the rectangle

sveticcg [70]

Answer:

$L= x$

And the width for this case is:

$W= 5x^3 +4 -x^2$

And we know that the perimeter is given by:

$P= 2L +2W$

And replacing we got:

$P(x) = 2x +2(5x^3 +4 -x^2)= 2x +10x^3 +8 -2x^2$

And symplifying we got:

$P(x)= 10x^3 -2x^2 +2x+8$

Step-by-step explanation:

For this problem we know that the lenght of the rectangle is given by:

$L= x$

And the width for this case is:

$W= 5x^3 +4 -x^2$

And we know that the perimeter is given by:

$P= 2L +2W$

And replacing we got:

$P(x) = 2x +2(5x^3 +4 -x^2)= 2x +10x^3 +8 -2x^2$

And symplifying we got:

$P(x)= 10x^3 -2x^2 +2x+8$

8 0

3 years ago