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Feliz [49]
3 years ago
6

Helppppppp meeeeeee I don’t understanddddd

Mathematics
1 answer:
scoundrel [369]3 years ago
5 0

Answer:

DF = 9.5

Step-by-step explanation:

Given 2 secants from an external point to the circle, then

The product of the external part and the whole of one secant is equal to the product of the external part and the whole of the other secant, that is

DE × DF = DC × DB

5(5 + x) = 5(5 + 4.5) ← divide both sides by 5

5 + x = 5 + 4.5

5 + x = 9.5 ( subtract 5 from both sides )

x = 4.5

Then

DF = DE + EF = 5 + 4.5 = 9.5

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nasty-shy [4]
\dfrac{5}{8} -  \dfrac{5}{12} ( 3 -  \dfrac{1}{4} )+  \dfrac{2}{3}

= \dfrac{5}{8} -  \dfrac{5}{12} (2\dfrac{3}{4} )+  \dfrac{2}{3}

= \dfrac{5}{8} -  \dfrac{5}{12} (\dfrac{11}{4} )+  \dfrac{2}{3}

= \dfrac{5}{8} -  \dfrac{55}{48}+  \dfrac{2}{3}

= \dfrac{30}{48} -  \dfrac{55}{48}+  \dfrac{32}{48}

= \dfrac{7}{48}

6 0
3 years ago
Jaelynn has 30 times as many stickers as her brother. Her brother has 8 stickers. How many stickers does Jaelynn have?
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For example( and this is straight from the paper), "15 people in 3 equal rows."
densk [106]
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6 0
3 years ago
A triangle has sides with lengths of 8 millimeters, 15 millimeters, and 17 millimeters. Is it a right triangle?
olga nikolaevna [1]

Answer:

yes.

Step-by-step explanation:

to find this answer, use the pythagoras theorem. the pythagoras theorem states that a² + b² = c².

to see if this is a right angled triangle, we will use this formula, as the pythagoras theorem only works for right angled triangles.

we are going to work out c, which is always the hypotenuse. the hypotenuse is the longest side of a triangle, that is larger than the other values. we know that the hypotenuse of this triangle is 17, so let’s see if that’s the answer we get.

calculation:

a² + b² = c²

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c = ?

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√289 = c

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the pythagoras theorem correctly identified the length of the hypothenuse. as i said earlier, this theorem only works on right angled triangles, therefore, this triangle is right angled.

6 0
3 years ago
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