3 years ago

Hey, can anyone help me with part A??

Mathematics

1 answer:

LekaFEV [45]3 years ago

3 0

9514 1404 393

Answer:

3.75 cm

Step-by-step explanation:

Corresponding sides are proportional.

CD/BC = BC/AB

CD = (BC)²/AB . . . . . multiply by BC

CD = (6 cm)²/(9.6 cm) = (36/9.6) cm

CD = 3.75 cm

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There is 3/4 of pizza leftover from the night before . how many 1/8 portions are there

serg [7]

We want to know how many 1/8's are in 3/4, so we divide.

$\sf\dfrac{3}{4}\div\dfrac{1}{8}$

Flip the 2nd fraction and multiply:

$\sf\dfrac{3}{4}\times\dfrac{8}{1}$

Multiply the numerators and denominators together:

$\sf\dfrac{3\times8}{4\times1}\rightarrow\dfrac{24}{4}$

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3 0

3 years ago

Read 2 more answers

Exercise

Maurinko [17]

X - nominator
y - denominator

$\frac{3x}{y+12}=\frac{3}{4}\\
\frac{x+7}{3y}=\frac{1}{2}\\\\
3(y+12)=12x\\
2(x+7)=3y\\\\
3y+36=12x\\
2x+14=3y\\\\
2x+14+36=12x\\
10x=50\\
x=5\\\\
3y=2\cdot5+14\\
3y=10+14\\
3y=24\\
y=8\\\\
\frac{x}{y}=\boxed{\frac{5}{8}}$