Multiply to give you 10 and add to give you 7.

so what you mean

Steps:

a. xy = 10

b. x+y = 7

x+y = 7

y = 7 - x

xy = 10

x(7 - x) = 10 (substitution of y)

7x - x² = 10

-x² + 7x - 10 = 0

here we have a quadratic equation that we will solve by using the quadratic formula

a = -1 | b = 7 | -10

x = (-7±√((-7)²-4×(-1)×(-10)))/2×(-1)

x = (-7±√(49-40))/-2

x = (-7±√9)/-2

x = (-7±3)/-2

x = -4/-2 , -10/-2

x = 2 , 5

check:

2×5 = 10

2+5 = 7

answer:   28.56 feet (approx)

step-by-step explanation:

since, triangle abc has measure of angle c equal to 55 degrees, measure of angle abc equal to 90 degrees, and length of bc equal to 20 feet.

we have to find out the measurement of segment ab.

therefore, tan 55° =

but bc = 20 feet.

⇒ tan 55 ° =  

⇒ ab = 20 × tan 55 °

⇒ ab = 20 × 1.42814800674

⇒ ab = 28.5629601348   ≈ 28.56 feet