3 years ago

Find a formula for a function f(x,y,z) whose level surface f=81 is a sphere of radius 9, centered at the origin.

Mathematics

1 answer:

Mrrafil [7]3 years ago

4 0

$81(9 \times 8 = 72 + 9) = 81$

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4/7 of the children in a pool are girls. What is the ratio of girls to boys?

marshall27 [118]

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3/7 of the children in the pool are boys
4/7:3/7
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3 years ago

A recipe calls for 3/4 cup of butter. Angie wants to triple the recipe, but she has only 1 5/8.

Lyrx [107]

Let's start out by tripling the original recipe to see how much butter Angie needs.

$\frac{3}{4} * 3 = total$
$\frac{3* 3}{4} = total$
$\frac{9}{4} = total$
$2 \frac{1}{4} = total$

So we need $2 \frac{1}{4}$ cups of butter, but Angie only has $1 \frac{5}{8}$ . Let's subtract what Angie has from the total to see how much more she needs.

$2 \frac{1}{4} - 1\frac{5}{8} = n$
$\frac{9}{4} - \frac{13}{8} = n$
we will need the least common denominator for both fractions
$\frac{2}{2} *(\frac{9}{4}) - \frac{13}{8} = n$
$\frac{18}{8} - \frac{13}{8} = n$
$\frac{5}{8} = n$

So Angie need $\frac{5}{8}$ cups more of butter for the recipe.

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3 years ago

Evaluate the expression a2+6ab for a=−3 and b=4.

xxTIMURxx [149]

(-3)2+6(-3)(4) is -63

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4 years ago

The answer to: expand and simplify 3x + 2 (x +5)

BARSIC [14]

Expanded: 3x^2 + 17x +10
Simply: it’s already simplified

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3 years ago