Which function does not have a domain of all real numbers

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?

Agarden consists of an apple tree, a pear tree, cauliflowers, and heads of cabbage. there are 40 vegetables in the garden. 24 of them are cauliflowers. what is the ratio of the number of cauliflowers to the number of heads of cabbage?