If DF =9x-39, find EF

EF = 58

Step-by-step explanation:

From the question given, we obtained the following information:

DF = 9x – 39

DE = 47

EF = 3x + 10

EF =?

We'll begin by calculating the value of x.

This can be obtained as follow:

DF = DE + EF

DF = 9x – 39

DE = 47

EF = 3x + 10

DF = DE + EF

9x – 39 = 47 + 3x + 10

9x – 39 = 47 + 10 + 3x

9x – 39 = 57 + 3x

Collect like terms

9x – 3x = 57 + 39

6x = 96

Divide both side by 6

x = 96/6

x = 16

Finally, we shall determine the value of EF as follow:

EF =?

x = 16

EF = 3x + 10

EF = 3(16) + 10

EF = 48 + 10

EF = 58

341

step-by-step explanation:

all you have to do is 9x31 (which equals 279) and then 20x31 (which equals 620). then you have to subtract. 620-279=341.