À study of blood flow involved 27 healthy people aged 18 to 72. Each subject con flow was measured on the first and fifth days of the study. After 5 days, researchers measured what they called "significant improvement" in blood flow and the function of the cells that line the blood vessels. t3 What flaw in the design of this experiment makes it impossi- ble to say if the cocoa really caused the improved blood flow? Explain your answer.

i wish i could u

step-by-step explanation:

i wish i could u

c. 27 units.

step-by-step explanation:

we are told that in circle a, ∠bae ≅ ∠dae.

we can see from our given diagram that in and ;

, as these are radii of our given circle.

therefore, by sas congruence postulate.

hence, side be will be equal to side de as corresponding parts of congruent triangles are congruent. so we can set an equation to find the value of x as:

now let us substitute x=17 in the expression for the length of be.

therefore, length of be will be 27 units and option c is the correct choice.

b

step-by-step explanation: