3 years ago

Can somebody help me out pleaseeee ??

Mathematics

2 answers:

frutty [35]3 years ago

8 0

answer : 54cm^2

pythagorus’ theorum : a^2 + b^2 = c^2

so 9^2 + x^2 = 15^2, x being the missing length

work out x ...

81 + x^2 = 225

x^2 = 144

x = 12

area of a triangle : 0.5 x base x height

so 0.5 x 9 x 12 = 54

nexus9112 [7]3 years ago

5 0

Answer:

67.5cm^2

Step-by-step explanation:

area of a triangle is 0.5xaxb

You might be interested in

I need help plz 10 points

Vaselesa [24]

Answer:

87.9

Step-by-step explanation:

$\pi {2}^{2} \times 2 + 2\pi \times 2 \times 5 = 28\pi = 87.9$

5 0

2 years ago

How many ways can a committee chairman choose 4 people for a subcommittee if there are 12 members on the whole committee?

Marina86 [1]

A group of k elements can be chosen from a group of n elements in $\frac{n!}{k!(n-k)!}$ ways.

$(^{12} _4)=\frac{12!}{4!(12-4)!}=\frac{12!}{4! \times 8!}=\frac{8! \times 9 \times 10 \times 11 \times 12}{2 \times 3 \times 4 \times 8!}=\frac{9 \times 10 \times 11 \times 12}{2 \times 3 \times 4}= \\ \\
=3 \times 5 \times 11 \times 3=495$

The answer is B. 495.

7 0

3 years ago

These are the right answers

Elza [17]

Wdym “these are the right answers”..?

5 0

3 years ago

A group of scientists have been sent on an expedition to test the soil in the Allegheny Mountains. They need to collect samples

3241004551 [841]

It’s B. 52 units ...

9 0

2 years ago