If two lines intersect at a 90 degree angle, what can you say about the lines?

A. They are perpendicular.

B. They are parallel.

C. They are complementary.

D. They are supplementary.

Luis made 80% of what he made last week. If he made 72$ this week, how much did he make last week

Which number should each side of the equation 45x=845x=8 be multiplied by to produce the equivalent equation of x = 10? -45-45 1515 5454 5

Let "a" represent Andrew's age TODAY. Write an expression to represent the situation. Andrew's age in 4 years.

Which number is not in scientific notation? A. 11 times 10 to the 21st power? B. 5.7 times 10 to the 9th power? C. 3.1 times 10 to the - 12th power? Or D. 1.67 times 10 to the - 5th power?

Rarotonga Holiday Sally and Mike have been in lockdown with their two children in Auckland for the April holidays. Luckily both are able to work from home, but have to employ a nanny to look after the children.

Find the LCM of 6 and 12

The sum of the digits of a two digit number is 6 when the numbers are reversed the number decreases by 18

Central Middle School sold 50 tickets for one night of the school play. Student tickets sold for $2 each and adult tickets sold for$3 each. They took in $135. How many of each type of ticket did they sell?

I have done a math equation for school and i forgot if i could leave a inproper fraction as my answer or if its a fraction i can reduce should i or should i not

Enter the value of n so that the expression (-y + 5) + (7y - 9) is equivalent to (ny - 4)