Solve the following equation please it's urgent

3a + 5b = -9 , 2a + 5b = -11​

3a - (5b+2a) - 7b = -12b + a

Step-by-step explanation:

3a - (5b+2a) - 7b

= 3a - 5b - 2a - 7b

= 5b - 7b + 3a - 2a

= -12b + a

Ans -12b + a

explanation:

infrared radiation has wavelength in the range between 700 nm and 1 mm. lets' convert these values into scientific notation, keeping in mind that:

let's start from the lower value, we have:

(we moved the dot two places to the left, so we increased the exponent by 2 units, from -9 to -7)

the higher value is:

so, the range of wavelength of infrared radiation is:

for this case we have that by definition, the volume of a cylinder is given by:

where:

r: it's the radio

h: it's the height

we have as data that:

substituting:

so, the cylinder volume is

option d