Which expression represents the sum of 21 and an unknown number?
a. 21-d
b. 21+d
c. 21÷d
d.21d

Which region represents the solution to the given system of inequalities? |-0.5x+y23 | 1.5x+ys-1 5 4 -3 -2 -1 1 2 3 4

Ineeeeed this is due tomorrow and i dont know the answer can you find all the exponents

Prove the divisibility of the following numbers: 25^9 + 5^7 is divisible by 30.also, read as (25 to the power of 9) + (5 to the power of 7) is divisible by 30. blank x 30what is the blank? ( it should be expressed in exponent form)