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2 years ago

I need the answer pls and ty

Mathematics

1 answer:

choli [55]2 years ago

4 0

Answer:

Step-by-step explanation:

45-45-90 triangles have the ratio 1:1:sqrt(2) on their sides

20sqrt(2):20sqrt(2):20(2)/40 satisfies this ratio

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How many ways can you make 35?

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5*7, 7*5, 35*1

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Which expression would be equivalent if you expanded −2(−8x+12y)?

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Element X decays radioactively with a half life of 8 minutes. If there are 980 grams of Element X, how long, to the nearest tent

Marysya12 [62]

Answer:

$t \approx 36.1\,min$

Step-by-step explanation:

The time constant for the isotope decay is:

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Now, the decay of the isotope is modelled after the following expression:

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2 years ago

Which expression can be used to find the surface area of the following square pyramid

andreyandreev [35.5K]

Answer:

$36+15+15+15+15$

Step-by-step explanation:

For the surface area we need to add up all the areas in the pyramid:

area of the base

area of the triangle sides (there are 4 triangles)

Area of the base:

the base is a square, and the area of a square is given by:

$a_{base}=l^2$

where $l$ is the length of the side: $l=6$ , thus:

$a_{base}=(6)^2\\a_{base}=36$

Area of the triangles:

one triangle has the area given by the formula:

$a_{triangle}=\frac{b*h}{2}$

where $b$ is the base of the triangle: $b=6$

and $h$ is the height of the triangle: $h=5$ , thus we have the following:

$a_{triangle}=\frac{6*5}{2} \\\\a_{triangle}=\frac{30}{2} \\\\a_{triangle}=15$

the expression that represents the surface area of the pyramid is:

$a_{base}+area_{triangle}+area_{triangle}+area_{triangle}+area_{triangle}$

substituting our values:

$36+15+15+15+15$

which is option B

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