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tia_tia [17]
2 years ago
7

A zucchini plant in Darnell’s garden was 10 centimeter y’all when it was first planted since then it has grown approximately 0.5

centimeter per day write a rule to describe a the function after how many days will the zucchini plant 18.5 centimeter tall
Mathematics
1 answer:
trapecia [35]2 years ago
8 0

After 17 days

d=numbers of days

10+0.5d=18.5

0.5d=8.5

divide both sides by 0.5

d=17

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\left\{\begin{array}{ccc}4x\times9y=7&(1)\\4x-9y=9&(2)\end{array}\right\\\\(2)\\4x-9y=9\qquad\text{subtract}\ 4x\ \text{from both sides}\\-9y=-4x+9\qquad\text{change the signs}\\9y=4x-9\qquad\text{substitute it to (1)}\\\\4x(4x-9)=7\qquad\text{use the distributive property}\ a(b+c)=ab+ac\\(4x)(4x)+(4x)(-9)=7\\(4x)^2-36x=7\\(4x)^2-2(4x)(4.5)=7\qquad\text{add}\ 4.5^2\ \text{to both sides}\\(4x)^2-2(4x)(4.5)+4.5^2=7+4.5^2\qquad\text{use}\ (a-b)^2=a^2-2ab+b^2

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