What is the change in elevation from 70 below sea level to 40 above sea level

110

Step-by-step explanation:

70 below sea level is kinda like -70 and 40 above is just... 40. So to get 110 you add 70  to -70 and 40 to the first sum and then add 70 and 40 together. Your sum will be 110!

Hope this helps!

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.