3 years ago

Find the value of DE.

Mathematics

1 answer:

Dennis_Churaev [7]3 years ago

6 0

Answer:

DE = 5

Step-by-step explanation:

The 3 sides of the triangle are congruent , then

DF = EF , that is

$\frac{2}{5}$ a - 15 = $\frac{1}{5}$ a - 5 ( multiply through by 5 to clear the fractions )

2a - 75 = a - 25 ( subtract a from both sides )

a - 75 = - 25 ( add 75 to both sides )

a = 50

Then

DE = EF = $\frac{1}{5}$ × 50 - 5 = 10 - 5 = 5

You might be interested in

BaLLatris [955]

What’s the answer bcuz I need it right now?

8 0

3 years ago

Read 2 more answers

Peter and his four brothers combined all of their money to buy a video game. If 30% of the total money is Peter's, and $12.00 of

kari74 [83]

Answer:

$20.00

Step-by-step explanation:

t represents the total amount

0.25t = 5.00

Can you solve for t and answer?

Or logically

Peter's $5.00 is 1/4 (25%) of the total.

Therefore 4/4 is $20.00

6 0

2 years ago

Read 2 more answers

Please help, calculators wont work for the problem. <br> (a - 2b)^2

lesya692 [45]

a-2b
× a-2b
${a}^{2} - 4ab + {4b}^{2}$

3 0

4 years ago

Read 2 more answers

Use the associative property to rewrite (w+4)+(-3)

Ne4ueva [31]

$(w+4)+(-3)=w+(4-3)$

4 0

4 years ago

Simplify: 6k + 2 = 8. Enter the value of k. *

Marizza181 [45]

6k + 2 = 8

Isolate the 8. Do the opposite of PEMDAS.
Note the equal sign. What you do to one side you do to the other.

Subtract 2 from both sides

6k + 2 (-2) = 8 (-2)
6k = 8 - 2
6k = 6

Isolate the k, divide6 from both sides.

6k/6 = 6/6

k = 6/6
k = 1

1 is your answer.

Hope this helps

4 0

3 years ago

Read 2 more answers