Which of the following is equivalent to (4 x 10^-7) + (5 x 10^-7)

A. 9 x 20^-14

B. 90^-7

C. 9 x 10^-7

D. 9 x 20^-7

Ben drinks tea at an incredible rate. He drinks 3 1/2 liters of tea every 2/3 of an hour. Ben drinks tea at a constant rate.

Can I make a right angle by drawing an acute angle and and an obtuse angle that share a common ray?

What's the missing value in the solution to the equation of y+2=-3 (x-4) If y = -2

A colony of ants has 50,000 members. Sam thinks the colony will grow at a rate of 4.5% each hour. About how many ants should he expect there to be in the colony after 10 hours

A machine makes 18 parts each hour. If the machine operates 24 hours a day, how many parts can it make in one day?

Each decimals is a percent

The annual salary for a computer technician at Company A ranges from $41,000 to $63,000, with a mean of $58,000. At Company B, the annual salary for the same position ranges from $45,000 to $$65,000, with a mean of $56,000.

Marika and her three friends attend the school play. Tickets cost 5.75 each, and marika paid for everyone. Find the total cost of the tickets

A particular metal alloy a has 20% iron and another alloy b contains 60% iron. how many kilograms of each alloy should be combined to create 80 kg of a 52% iron alloy?

Imena's math test scores are 83, 93, 78, 89, and 83. She has one more math test this semester. What score most she get on the test to have a median score of 85?