What is nine tenths in standard form?

I know it's simple but I forgot.

Is the quotient of (-5) ➗ (-7) a rational number? Explain your answer in two or more sentences.

Why cant 81-x to the forth power be factored unti (3+x) squared times (3-x) squared

Find the least common denominator for these fractions. 5/7 and 4/6

Dao has a cookie recipe that calls for 3 1/4 cups of flour. He plans to make 1 1/2 batches of cookies. Explain whether Dao will need more flour, less flour, or the same amount of flour as a recipe calls for.

An initial population of 265 quail increases at an annual rate of 21%. Write an exponential function to model the quail population. What will the approximate population be after 3 years?

Brad puts an equal amount of money in his savings account once a month. He started with $25. The next month, he had $35 in his account. Two months after that, he had $55 in his account.

What value of x makes this statement true? 3x + 4 = 9x - 8 A. - 2 B. 1 C. 2 D. 12

Find the geometric mean of 4 and 10.

Round 475 to the nearest hundred.

in the recent presidential election, Ohio had 18 electoral votes. This is 20 votes less than Texas had. How many electoral votes did Texas have?