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2 years ago

In an arboretum, the heights of five trees were 21 feet, 31 feet, 36 feet, 28 feet,

Mathematics

1 answer:

lbvjy [14]2 years ago

6 0

Answer:

Step-by-step explanation:

(21+31+36+28+26+x)/6=28

21+31+36+28+26+x= 28×6

142+x =168

x=168-142

x=26

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1 year ago

Evaluate the expression 5a + 5b. Let a = -6 and b = -5.

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melisa1 [442]

Answer:

Vertex form: $f(x) =(x +\frac{7}{2})^2 -\frac{53}{4}$

The vertex is $(-\frac{7}{2},-\frac{53}{4})$

Step-by-step explanation:

For a general quadratic function the form is:

$ax ^ 2 + bx + c$

For the function

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The values of the coefficients for the function are the following: $a = 1$ , $b =7$ , $c = -1$

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Add and subtract $\frac{49}{4}$

$f(x) = (x ^ 2 +7x +\frac{49}{4}) -\frac{49}{4}- 1$

Write the expression of the form

$f(x) = (x+\frac{b}{2})^2 +k$

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