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Xelga [282]
3 years ago
7

There are 90 students, 10 leave. What percentage stayed?

Mathematics
2 answers:
torisob [31]3 years ago
8 0
Yes 80% stayed hope this helps
olga_2 [115]3 years ago
8 0
90-10= 80/90 because there used to be 90 students

Just simply divide 80/90= .88 So about 88% stayed if you round it it would be 89%
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A pine tree grows about 18 inches per year. After how many years will the tree be 90 inches tall? [Type your answer as a number.
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5 years because when you divide 90 by 18 to get how many years it takes the tree to grow to 90 inches tall, you get 5.

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3 years ago
The tile along the edge of a triangular community pool needs to be replaced.
Gre4nikov [31]

Answer:

Third option: 12x^2+8x+25

Step-by-step explanation:

s1=8x^2

s2=4x^2+15

s3=8x+10

Total perimeter of the pool edge: P

P=s1+s2+s3

Replacing s1, s2 and s3 in the formula above:

P=(8x^2)+(4x^2+15)+(8x+10)

P=8x^2+4x^2+15+8x+10

Adding like terms:

P=12x^2+8x+25

6 0
3 years ago
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I believe it is an inscribed angle but I am not positive
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Find the interval(s) of upward concavity on this accumulation function.
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6 0
3 years ago
Proving trapezoid theorems Geometry
Artist 52 [7]

Answer:

ΔABD ≅ ΔACD by SAS, therefore;

\overline {BD} \cong \overline {CA} by CPCTC

Step-by-step explanation:

The two column proof is presented as follows;

Statement {}                   Reason

ABCD is a trapezoid {}  Given

\overline {BA} \cong \overline {CD}  {}                   Given

\overline {BC} \parallel \overline {AD}   {}                   Definition of a trapezoid

ABCD is an isosceles trapezoid  {}    Left and right leg are equal

∠BAD ≅ ∠CDA  {}          Base angle of an isosceles trapezoid are congruent

\overline {AD} \cong \overline {AD}   {}                  Reflexive property

ΔABD ≅ ΔACD   {}         By SAS rule of congruency

\overline {BD} \cong \overline {CA}   {}                  CPCTC

CPCTC; Congruent Parts of Congruent Triangles are Congruent

SAS; Side Angle Side rule of congruency

8 0
3 years ago
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