Identify the type of chemical reaction. H₂CO₃ > H₂O + CO₂

A) decomposition

B) exchange

C) reversible

D) synthesis

3/4 ÷ 3/4

step-by-step explanation:

basically divide any proper fraction with itself to fit the criteria.

so if we are using 3/4, then:

3/4 ÷ 3/4 = 1

so 1 is the quotient.

and the numerators for both these fractions is 3.   and if we divide the numerators:

3 ÷ 3 = 1

we see that quotient is equal to our original quotient as well.

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225

m∠a is 90°

m∠b is 40°

y=-2.5x+12.5

step-by-step explanation:

5y=2x+10

y=0.4x+2

slope=-2.5

5=-2.5*3+b

b=12.5