I need help with this asap please!!!

Mathematics

1 answer:

Dvinal [7]3 years ago

3 0

Answer:

Step-by-step explanation:

54x

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Someone help me out pls

Leni [432]

Answer:

EF ≈ 3.8

Step-by-step explanation:

Using the Sine rule in Δ DEF

$\frac{EF}{sin75}$ = $\frac{DE}{sin50}$ , that is

$\frac{EF}{sin75}$ = $\frac{3}{sin50}$ ( cross- multiply )

EF × sin50° = 3 × sin75° ( divide both sides by sin50° )

EF = $\frac{3sin75}{sin50}$ ≈ 3.8

8 0

3 years ago

1.8 divided by 12.42 with work shown, please

goldfiish [28.3K]

Answer:

10/69

Step-by-step explanation:

1.8 divided by 12.42

Convert decimal into a fraction

9/6 divided by 621/50

Divide by a fraction, multiply by the reciprocal of that fraction.

9/6 * 50/621

Reduce the numbers with the greatest common divisor 5

9 * 10/621

Reduce the numbers with the greatest common divisor 9. And your answer is...

10/69

8 0

4 years ago

How to solve using perfect square <br> x^2-4x-32=0

zmey [24]

$Perfect\ square:(a-b)^2=a^2-2ab+b^2\\\\x^2-4x-32=0\ \ \ \ |add\ 32\ to\ both\ sides\\\\x^2-4x=32\\\\x^2-2x\cdot2=32\ \ \ \ |add\ 2^2\ to\ both\ sides\\\\x^2-2x\cdot2+2^2=32+2^2\\\\(x-2)^2=32+4\\\\(x-2)^2=36\iff x-2=-\sqrt{36}\ or\ x-2=\sqrt{36}\\\\x-2=-6\ or\ x-2=6\ \ \ \ |add\ 2\ to\ both\ sides\\\\\boxed{x=-4\ or\ x=8}$