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2 years ago

9

A 6 feet tall boy cast a shadow of 9 feet at the same time of day at the shadow of the tree measures 21 feet what is the height

of the tree

1 answer:

Leto [7]2 years ago

7 0

Answer:

The shadow of the tree is 14 feet

Step-by-step explanation:

6x21=126

126/9=14

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Use the quadratic formula to solve the equation x2+7x

monitta

The solution of the equation x2+7x is 0, -7 using the quadratic formula.

Step-by-step explanation:

x2 + 7x = 0

-b ± √ b2 - 4(ac)/ 2a

substitution,

a = 1, b = 7, c = 0

= -7 ± √(7)2 - 4(1 x 0) / 2 x 1

= - 7 ± 7 / 2

x = 0 , -7

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2 years ago

Factor this x^3 + 27

masya89 [10]

(x+3)(x^2-3x+9)

this gets the x^3 while the 3x cancels out and 3*9=27

hope this helps although i didn't explain very well :)

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2 years ago

Helppp me Please!!!!! :)

irina [24]

Answer:

$x = 30 \\ y = 10$

Step-by-step explanation:

$8x + 6y = 300 \\ x + y = 40 \\ 6x + 6y = 240 \\ 2x = 60 \\ = > x = 30 \\ y = 10$

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2 years ago

9+w>7 what is the inequality?

Troyanec [42]

Answer:

w > -2

Step-by-step explanation:

9 + w > 7

Subtract 9 from both sides to end up with w alone on the left side.

w > -2

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2 years ago

Read 2 more answers

Joni said that she could rewrite the expression d^3•d^11 as d^33. What mistake did Joni make?

Rudik [331]

Answer:

Joni's mistake was to multiply the exponents instead of adding the exponents.

Step-by-step explanation:

we know that

When multiplying two powers that have the same base, you can add the exponents

so

$d^{3} *d^{11} =d^{3+11}=d^{14}$

Joni's mistake was to multiply the exponents instead of adding the exponents.

7 0

2 years ago