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2 years ago

Help pls!!!

Mathematics

1 answer:

expeople1 [14]2 years ago

5 0

That is a good definition

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A rally car race course covers 515.97 miles. The winning car completed the course in 6.5 hours. What was the average speed of th

evablogger [386]

Answer:

79.38 miles per hour

Step-by-step explanation:

average speed = miles covered / hours

= 515.97 / 6.5

= 79.38

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3 years ago

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Use the formula c=d and = to find the diameter of this circle whose circumference equals 172.7cm

igomit [66]

Answer

im only in year 9 do you expect me to know that ????????????????????????????

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2 years ago

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If the second number is subtracted from the sum of the first number and 2 times the third number, the result is 1. The thrid num

weeeeeb [17]

Answer:

Step-by-step explanation:

$x,\ y,\ z-\text{three numbers}\\\\\left\{\begin{array}{ccc}(x+2z)-y=1&(1)\\z+2x=3&(2)\\x+3y+z=18&(3)\end{array}\right\\\\(2)\\z+2x=3\qquad\text{subtract}\ 2x\ \text{from both sides}\\z=3-2x\qquad(*)\\\\\text{Substitute}\ (*)\ \text{to (1) and (3)}\\\\\left\{\begin{array}{ccc}x+2(3-2x)-y=1&\text{use the distributive property}\\x+3y+(3-2x)=18\end{array}\right$

$\left\{\begin{array}{ccc}x+(2)(3)+(2)(-2x)-y=1\\x+3y+3-2x=18&\text{subtract 3 from both sides}\end{array}\right\\\left\{\begin{array}{ccc}x+6-4x-y=1&\text{subtract 6 from both sides}\\(x-2x)+3y=15\end{array}\right\\\left\{\begin{array}{ccc}(x-4x)-y=-5\\-x+3y=15\end{array}\right\\\left\{\begin{array}{ccc}-3x-y=-5&\text{multiply both sides by 3}\\-x+3y=15\end{array}\right$

$\underline{+\left\{\begin{array}{ccc}-9x-3y=-15\\-x+3y=15\end{array}\right}\qquad\text{add all sides of the equations}\\.\qquad-10x=0\qquad\text{divide both sides by (-10)}\\.\qquad\boxed{x=0}\\\\\text{Put it to the second equation:}\\-0+3y=15\\3y=15\qquad\text{divide both sides by 3}\\\boxed{y=5}\\\\\text{Put the value of}\ x\ \text{to}\ (*):\\\\z=3-2(0)\\\boxed{z=3}$

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3 years ago

Write a rule to describe each translation

ArbitrLikvidat [17]

Answer:

slide - translate

Step-by-step explanation:

you slided them both as neither of the figures changed

6 0

1 year ago

Find the length of a hypotenuse whose legs are 5 and 6

avanturin [10]

Answer:

that other person is right

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2 years ago