Answer:
14
Step-by-step explanation:
first use the pythagorean theorem to find the length of the line adjacent to 4
4^2+x^2=5^2
16+x^2=25
x^2=9
x=3
then you can use the triangle area formula to find the area of the entire triangle
4*(3+7)*1/2=4*10*1/2=20
then, we find the area of the triangle that we need to subtract from the entire triangle
4*3*1/2=6
20-6=14
