When writing expressions for complex numbers, what does i represent?

50% of all the cakes Jenny baked that week were party cakes, 1/5 were fruit cakes, and the remainder were sponge cakes. What percentage of cakes were sponge cakes?

Determine if the equation y = (1.2) x represents exponential growth or decay.

Write to Explain-Lucy danced for an hour, practicing ballet, jazz, and tap. She practiced twice as long on jazz as tap. She practiced ballet as many minute as tap.

Juliana is trying to solve the problem below. The value of a used car is decreasing by $40 per month. How many months will it take for the value to decrease from $5500 to $4300?

Andy earns $200 per week working part-time at a fast food restaurant. Last week he was ill, so he only earned $120. By what percent did Andy's salary decrease

while playing basketball, jada's heart rate goes up to 160 beats per minute. whe jogging her heart beats 25 times in 10 seconds.

What does 12 times a number mean as an expression?

Emma seys that the preduct of a 3-digit number and a 1-digit number will be either a 3 digit number or a 4 digit number. Does Emma's statement make sense

Work out the value of these two questions: 1) 3^2 + 2^3 2) 2^4 - 3^2

What is 5 1/4 divided 2 2/7