Mathematical Process Standards>Applying Mathematics to Everyday Life and Work(TEKS.Math.7.1.A)
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Texas 7th Grade Math › Mathematical Process Standards>Applying Mathematics to Everyday Life and Work(TEKS.Math.7.1.A)
A cell phone plan costs 40 per month plus 0.12 per text over 300 texts. Alex sent 520 texts this month. Which expression gives Alex's total bill for the month?
40 + 0.12(520 - 300)
40 + 0.12(520)
0.12(520 - 300)
40 + (520 - 300)/0.12
Explanation
Monthly fee 40 plus overage: 0.12 per text for (520 − 300) = 220 extra texts, so total is 40 + 0.12(520 − 300). Choice B charges for all 520 texts. Choice C omits the fixed 40. Choice D divides by 0.12 instead of multiplying.
A ride-share app charges a base fee of 2.50 plus 1.80 per mile. Jen's trip was 12 miles. Which equation correctly models the total cost $C$ of this trip?
$C = 1.80(12)$
$C = 2.50 + 1.80(12)$
$C = 2.50 + 1.80 + 12$
$C = 2.50(12) + 1.80$
Explanation
Base fee 2.50 plus mileage: 1.80 per mile for 12 miles, so $C = 2.50 + 1.80(12)$. Choice A omits the base fee. Choice C adds 12 instead of multiplying by the rate. Choice D multiplies the base fee by miles, which is incorrect.
An online shop sells notebooks for 3.25 each and charges a one-time shipping fee of 6.50 per order. Maya buys 8 notebooks. What is the total cost?
$3.25 + 8 + 6.50$
$3.25 \times 8$
$32.50$
$6.50(3.25 + 8)$
Explanation
Item cost: 3.25 each for 8 notebooks gives 3.25 × 8 = 26. Add shipping 6.50 once: 26 + 6.50 = 32.50. Choice A adds instead of multiplying. Choice B omits shipping. Choice D multiplies shipping by the sum, which is not how fees work.
A gym charges a one-time sign-up fee of 20 and 15 per month. After 6 months, how much has Luis paid in total?
$41$
$90$
$135$
$110$
Explanation
Total = sign-up fee 20 + monthly cost 15 for 6 months: 20 + 15 × 6 = 20 + 90 = 110. Choice A adds all numbers. Choice B omits the sign-up fee. Choice C multiplies the sign-up fee by months, which is incorrect.
A plumber charges a 35 service call fee plus 60 per hour of work. She worked 2.5 hours. Which expression models the total charge?
35 + 60(2.5)
60(2.5)
35 + 60 + 2.5
35(2.5) + 60
Explanation
Total = fixed service fee 35 plus hourly charge 60 for 2.5 hours: 35 + 60(2.5). Choice B omits the fixed fee. Choice C adds the hours instead of multiplying by the rate. Choice D multiplies the fixed fee by hours, which is not correct.