An animal shelter spends $1.50 per day to care for each bird and $8.50 per day to care for each cat. alexander noticed that the shelter spent $108.00 caring for birds and cats on tuesday. alexander found a record showing that there were a total of 30 birds and cats on tuesday. how many birds were at the shelter on tuesday?

21 birds.

Step-by-step explanation:

Let B represent the number of birds and C represent the number of cats.

We have been given that an animal shelter spends $1.50 per day to care for each bird, so the amount spent on B birds will be 1.50B.

The animal shelter spends $8.50 per day to care for each cat, so the amount spent on C cats will be 8.50C.

Alexander noticed that the shelter spent $108.00 caring for birds and cats on Tuesday. We can represent this information in an equation as:

Alexander found a record showing that there were a total of 30 birds and cats on Tuesday. We can represent this information in an equation as:

We will use substitution method to solve system of linear equations.

From equation (2) we will get,

Substituting this value in equation (1) we will get,

Let us subtract 255 from both sides of our equation.

Let us divide both sides of our equation by -7.

Therefore, there were 21 birds at the shelter on Tuesday.

a: inscribed angles

step-by-step explanation:

i reviewed this question with a peer and teacher, seems to be correct, me later

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: